Could be. In my case stutters are always in the same point. Only three people in the thread can see them and in the same moments so maybe something is fucked in the conversion. Will download the video from YouTube and try it. Interesting if YouTube can add in this FH3 video the exact same problem than the game has.
Maybe you should step back and consider that the problem is with YouTube, and not the game or the video that Microsoft recorded?
It's really not hard to understand here. No one is lying to you. People - including me - are not observing the same stutters that you are.
YouTube automatically re-renders videos in countless different formats for different devices and different browsers which support different things. Maybe one of them got screwed up?
I personally am also not seeing any stutters using Chrome on Windows 10.
After some test the problem is in the version of the video in YouTube server that iOS uses.
Tested in iphone 5, 6 and 7. All three show the stutters in the same time every time. I recorded in slow motion the video (iPhone 7):
First stutter
https://m.youtube.com/watch?v=8hBOtdE94ho
Second
https://m.youtube.com/watch?v=7G19GJior70
Third
https://m.youtube.com/watch?v=lPNZJ2T5Fu8