I'd like to add, if what you are saying is possible, then if players were smart they'd use the lock when things aren't intense (to avoid blatent fuck ups in aim).
They'd use it on a small mouse movement plane and add the lock to that and they'd 'feel' the change, and when you watch the stream it doesn't look bad because there's no kill and he's not looking at him through the wall accidentally already.
For example, You'd look at the floor to line a smoke up, on your mouse stroke up to prime the nade, you tap your lock key and feel the movement, it then gives away the position of the enemy without being obvious. Take that into account and it's much easier to act that then it is in the intense moments, and there you have it EVERY SINGLE PLAYER IS AIMLOCKING.
So you either have substantial evidence that is undeniable and is well analysed, or you have a software detection such as VAC or you're just an idiot, as here.
edit: forgot to add how using such an aimlock or cheat actually effects how your brain would think and react in almost every situation, you'd be thinking if you should use it or not at every moment, is it going to look bad, etc. and it'd distract you from the game. It's blatant to spot wallhackers this way even if they are smart at trying to hide it - it's not too much of an addition to spot aimlockers.