> The german guy who was caught was saying a lot of these things which obviously weren't true, like claiming that a lot of other players in top teams were cheating on LAN, but in hindsight that hardly seems believable.

I mean, there were 3 pro players banned in like a week. I doubt this was coincidence [1].

> A driver cheat which would auto-inject code on insertion would as far as I know require a 0-day exploit on Windows, and I have a hard time believing one of the cheat makers was sitting on one of those

It's not completely out of the question. Check out this DEF CON hack which illustrates something similar[2].

[1] https://www.pcgamer.com/csgo-competitive-scene-embroiled-in-...

[2] https://theoutline.com/post/2032/how-to-hack-a-mouse-to-win-...