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Will it hold? Sure, but the question is for how long.
Over time, the drywall will crack internally and lose strength as the TV is moved around, eventually getting closer and closer to just the backing paper holding the TV up.
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"installing board(s) between existing studs"
An excellent suggestion.
Swing arm suggests someone wants to move it and even if drywall might hold a fixed mount I can't see it staying up over time when moving it.
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please do.
CI/CD = Continuous Impediment/Continuous Despair
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You mean moment, not momentum, I believe.
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I wouldn't do it. Over time those stupid drywall anchors work their way out, unless you use the butterfly type.
What I would do is install a couple of cross braces between the studs and mount the TV to that using lag bolts.
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
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I've even had butterfly anchors come out, along with a chunk of the drywall.
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Yeah, tbh i don't really trust them either. Drywall isn't meant to bear any kind of load.
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
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You could do all sorts of theoretical calculations but none of them would take into account the complex loads applied by kids (or grandkids) swinging on the end of the arm or by the cleaner doing whatever cleaners do (not currently understood by humans).
Phil
The opinions expressed in this post are not necessarily those of the author, especially if you find them impolite, inaccurate or inflammatory.
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kids (or grandkids) swinging on the end of the arm
You'd hope if said kids are tall enough to reach the arm, they'd be smart enough not to do that.
But, never underestimate what children's stupidity lack of fear will make them do.
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Even 1-year olds are tall enough when they have climbed on the dog and a chair!
Phil
The opinions expressed in this post are not necessarily those of the author, especially if you find them impolite, inaccurate or inflammatory.
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Don't do drywall. It's glorified cardboard.
GCS/GE d--(d) s-/+ a C+++ U+++ P-- L+@ E-- W+++ N+ o+ K- w+++ O? M-- V? PS+ PE Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
The shortest horror story: On Error Resume Next
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I was thinking more on the lines of chalk with a paper cover.
I’ve given up trying to be calm. However, I am open to feeling slightly less agitated.
I’m begging you for the benefit of everyone, don’t be STUPID.
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Depending on your skills, get a nice piece of wood screwed into nearby studs through the drywall.. Then paint it the same color as the wall. Mount the TV swing arm to that wood. Anybody that judges you for this isn't a friend 
Hogan
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or when judgmental company visits, push the TV back against the wall to cover the hacked up drywall!
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Would a longer arm let you reach a stud? It might be easier than messing with the wall.
I think one of the benefits of using an arm mount is you have more flexibility in where you attach it to the wall vs where you want the tv to rest.
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Don't cut the drywall. Just mount a 1 X 4 to two studs. Then mount the swing arm to the 1 X 4. Paint the 1 X 4 to match the drywall. Don't make it difficult.
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I ran into this problem over a decade ago at a previous home. I wanted to mount the TV over the fireplace but found that the studs were a few inches beyound the width of the mounting bracket. I bought a really nice piece of oak (3/4 x 6 x 30 I think), sanded it, put a nice stain on it, mounted it to the studs, then centered the TV bracket on that with lag bolts.
The difference is that my bracket didtn't extend or swivel, so the mounting board was pretty much hidden by the TV itself. Also, this was around 2009 and the original 42 inch flat screen I was hanging weighed 3x what they are today. (probably 35-40 lbs)
The really fun part was adding a receptacle and hdmi plug behind the TV and running those wires behind the wall/fireplace. 
"Go forth into the source" - Neal Morse
"Hope is contagious"
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I checked where the studs were; they didn't line up as they should have; so I didn't. Try and hold you TV at arms length and consider what is happening on the wall end. I was considering something "in between"; but it would have been too "unsightly" / too much work for a "hanger".
Actually, most people mount them where you're always "looking up". A "low" console table where the screen is "arm chair" eye level is perfect, IMO. So, I'm actually happy I didn't mount it "up" (in the living room).
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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I would not consider using ANY drywall anchor. I have installed two TVs on walls, one with a swing arm, and I made certain to utilize the wall studs. I would not do it any other way.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
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Kenneth Haugland wrote: drywall
It's probably been said already, the list of glomers-on right now is as long as my forearm, but this link to a "drywall anchor" video is missing the point. One doesn't have to view that video either to know that despite any other thing in the world of cheap beads and Rocco the DW assitant ... and a taper ... and a footstool/ladder ... that fastening ANYTHING to a vertical "wall" requires support from behind the sheetrock.
Don't you watch "This Old House", man? 
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If you are short term in the space,
buy a 3/4in 18mm plywood.
Cut it just wide enough to span the studs behind the sheetrock. You might need to span two full studs. about 32 inches. Depends on if the center of your mounting falls across one stud.If you are lucky, you will only need to span 16 inches.
Paint to match the wall.
Put some of the thin sticky non skid feet on the back where it will hit the studs.
This will stop it from messing up any texture on the wall.
Drill the screw holes through the plywood and into the studs. 4 holes or 6 holes if you had to span two studs. Drilling all of the holes first makes it easier to find any problems. (like missing the studs)
Wait 30 minutes in case you hit a pipe. Check for leaks! Plumbers should put metal plates on studs that have plumbing, but older houses won’t have them.
put in some strong screws.
mount the TV on the plywood.
When your lease is up, back out the screws and fill the holes with color matching toothpaste!
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So true: Language vs Consciousness[^] - well the end is bang on, anyway. 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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So very true!
Will Rogers never met me.
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