>It's quite literally impossible to cheat anymore (in a way that disturbs normal players for more than a few games)
AKA the way that is easiest to detect, and the easiest way to claim that the game doesn't have cheaters. Behavioral analysis doesn't work with closet cheaters, and they corrupt the community and damage the game in much subtler ways. There's nothing worse than to know that the player you've competed with all this time had a slight advantage from the start.
Overwatch has made the decision that closest cheaters are not a problem and have actually protected a cheater in contenders, although they were forced to leave the competitive scene. None of it ever became public.
In CS2, the game renders your enemies even though you can't see them (within some close range). The draw calls are theoretically interceptable (either on the software/firmware or other hardware level). Detecting this is essentially impossible because the game trusts that the GPU will render correctly.