The types of cheats that anti cheat in kernel space are trying to detect don’t view the video feed as such. They hook the process directly to read the memory, and the chest developer has reverse engineered the game binary to find out what variables correspond to things like opposing players, then using that information they draw stuff like wall hacks on the screen.

But yeah I guess an fps developer could move to a GeForce now type of model to eliminate cheats like that, but then no one would play that fps because of the input lag issues.