Using DuckDuckGo and searching for „Discord Search“ or „Discord Search Syntax“ makes this official help website appear in the top results, even as first. Also the syntax is shown when using the search.
https://support.discord.com/hc/en-us/articles/115000468588-Using-Search
First of all, I‘m not a fan of kernel level anti cheats either. I think your point shows the never ending cat and mouse game that game developers have to deal with. Implement what you described, catch a few cheaters. Now cheats developers add pseudo random deviations within the hitbox to their aim hack. From what I understood, the kernel level anti cheats aimed to abstract and attack at the single point that all cheats have in common. I am not up to date but I believe that single point is code, that is being injected into the game process, or another program messing with the allocated memory of the game process. At least that would make sense to me as to why such an intrusive implementation of anti cheat is necessary.
Anyway, in my opinion the gains do not justify it.