I'm sure he has kind of cheat for AWP. I caught him once when his knife was jumped the model instantly but wasn't able to record demo, after I told him his aim shaked then he never used knife again. And today his aim obviously shaked with AWP. That's why he never plays with any other gun except AWP.
there are some cfg's for awp, not hack or script, just writen for awp, for a fast switch, whatever, imo he's normal, kinda good skills, I've seen him playing m4 and ak and he's decent, no signe of hacks, with awp, he's average, when good players are playing, he kinda sucks. I'm tired I can't express my self well, just that in my opinion he's fine.
And sometimes, when you play too much awp, you'll have that little sense that automatically lets you shot the head.