Maybe so, but kernel cheats these days are extremely easy to make, even more so on linux (since you can just hotload them at will while windows whines about signing).

‘Never trust the client’ does very little to prevent automation and aimbots.

In league of legends for example, kernel cheats that auto-aim your skillshots and automatically walk out of the enemy’s were really common, especially in high elo, and there is nothing the server can do to prevent them. I’ve seen my fair share of cheaters around GM elo over the years, but now, I don’t think I’ve seen a single one since they added vanguard. Though it does suck that I still need a windows partition.