I really don't like how the author minimizes the kernel anticheat situation. It's not "a lot of noise online".
It doesn't matter that user mode software is also vulnerable. We actually have mitigations against many of those user mode problems. Separate user accounts for example. Games can't exfiltrate your browser data if they can't read them.
Obviously kernel mode software can bypass all sorts of operating system controls. Bypassing those controls is the whole reason why they implement anticheat in kernel mode. If they can't bypass these controls, it means the operating system is more powerful than the anticheat, which means it can be defeated.
Yes, proprietary software is inherently untrustworthy and could be malware in disguise. Nobody disputes this, it's happened before and will happen again. It's a good idea to invest in a properly virtualized system where all those games are contained and kept completely separate from the real system. Yet another reason why we don't need idiotic anticheat software bitching about the fact it's been virtualized.