can't reply to comments for some reason so here's your answers:
purg: according to a couple of this guy's other vids, the higher end is 500fps with top notch being 700fps, though some fields ban that kind of power. this gives 80m+ range.
cahu: some as any cheat, can't have fun without feeling cool, which means if you're not winning then to be cool and have fun you have to give yourself an edge. this and a couple other vids i've seen, when someone is really clearly cheating, they start going for the face. thought the same about the aim, though when they're releasing 2 vids per week, practice makes perfect seems to be the case.