The guy haszkejl is obviously using cheat engine or something like that. The video is smooth but he is lagging. The lagging is caused by using it. He is faster in his videos.

I personally don't see it but the run is assessed by the in game time so if he was speeding up his videos his time would be said by the game.

but hes clearly cheating in those videos

on maps oriental1 oriental3 mountain1 and mountain3 the times he did are impossible. It may seem possible due to small time difference

I sent this on discord https://imgur.com/a/Jzsb0qj

how you don't see how fast he's running