They're referring to the fact that Chinese game companies (Tencent, Riot through Tencent, etc.) all have executables of varying levels of suspicion (i.e. anti-cheat modules) running in the background on player computers.
Then they're making the claim that those binaries have botnet functionality.
They can exploit local priviledge escalation flaws without "RCE".
And you are right, kernel anti-cheat are rumored to be weaponized by hackers, and making the previous even worse.
And when the kid is playing his/her game at home, if daddy or mummy is a person of interest, they are already on the home LAN...
Well, you get the picture: nowhere to run, orders of magnitude worse than it was before.
Nowadays, the only level of protection the administrator/root access rights give you, is to mitigate any user mistake which would break his/her system... sad...
Then they're making the claim that those binaries have botnet functionality.