yes, kernel level cheats are a thing, but nowadays hardware level is getting common, plus with AI people have been making models who only use the video output which you can just get by splitting the signal and is completely undetectable and inject inputs directly at the hardware level with special periphals and runs in a separate computer, these AI cheats only provide aim assist and trigger assist, but are completely undetectable outside of Valve's style of server anticheat that actually analyses the inputs the clients send