Once you get a stomach bug and you should have gone to the bathroom a minute ago you'll figure it out :) . Hint: It's like the old days, like we've been doing it for millennia, if not millions of years. https://www.google.com/search?q=how+to+use+squat+toilet

Not sure how I feel about sharing this here but yeah, this should answer some of those questions.

The Youtuber is.. A 'comedian'..

This is a thing for westerners; the squat position (with feet flat on the floor) is really hard to do for a lot of them, iirc mostly having to do with ankle flexibility (for me personally anyway). In countries with squat toilets the people are a lot more used to the position / motion. I guess most people could get by with doing a toe squat, but that's harder to keep balance.