To what end? I read most of the article but I can’t understand the goals of these fakers?

Put shoe on head to verify

The hand in front of face thing is interesting, and in the video you can see clear distortion around the headphones which could have been a result of a replacement background.

I’d have requested they turn off all filters and see how they react to that. “Oh, I’m not running any filters.” would be a clear lie and a reason to end the interview.