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.

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