GrapeJuiceIIIb-b-b-b-but... mxr said there is no aimlock in tf2 that works through walls!!!
I think we all know that claim is bs just on principle, idk why he thinks that would be the case. I read that some sort of "silent aim" was patched a while ago, but that was more of fixing how aim assist snapping was hidden from stv/pov recordings. Granted, I dont have any first hand experience with cheats, so im kinda talking out my ass at this point. Im also pretty sure most cheats have an option to only lock if there is nothing between the two players, so it WOULD be REALLY DUMB to not have that option ticked, which is my only hold up. In theory, it should be easy to not be blatant. That being said, lifting your mouse, bumping your keyboard, pushing a side button on your mouse for push-to-talk etc can cause weird mouse flicks that every once and a while would "track" a player though a wall. (But maybe not like in this case, where it sticks to his head, pixel perfect, for a bit before he pulls is xhair far enough away at the weirdest time to be lifting your mouse or anything)