his said in a comment on one of his videos that he uses 24 cm/360. according to his battlefield settings hes uses 0.0362 ingame, which would be 24 cm/360 at 400 dpi. 400 dpi seems right from watching that aim booster video. maybe he changed his sens for cs, but in most of those videos i'm PRETTY sure he was using 24cm for bf4, especially considering he says on his twitch page thst his sens is "too damn high".

it's possible to aim like that at 24 cm/8.5 in per 360. definitely forced and unnecessary, but definitely possible.

ok this is beside the point...
hes literally flicking like he has a super high sensitivity, hes putting a lot more effort on swinging his arm across the desk/mousepad when he could be using a much higher sensitivity.

edit: ok so he uses a higher sens in battlefield, but his aim is still similar in cs

idk dude it seems pretty normal to me. i dont play bf but ive played dirty bomb a couple of times and there are comparable scenarios. lower-sens oriented game but sometimes you need to transfer quickly between targets

I use a 12 inch sens in TF2 and flick a lot like that simply because my wrists are fucked. I need to aim from the elbow/shoulder or my wrists end up massively inflamed.