I don't know if CS2 is any different but while CSGO didn't have a cheater in every single game it was at least 1-2 in 10 in ranked games at global elite level from my experience playing it on and off for many years (beta 0.6 to a few years ago). At that level they usually only use ESP/wallhack and toggle aim assist to avoid getting banned through overwatch. Was very common for them to toggle halfway through a game or so to avoid losing or if they think someone else is cheating.

Depends on your definition of overrun, I did use it a bit hyperbolically, but it seems you have no idea what you're talking about.