If you want to get away from LLM assisted code your best bet is NetBSD, with an older version of an X11 DE , using an older version of Firefox with JavaScript turned off.
If you do this you are basicly fully avoiding LLM assisted code. Be sure to check every thing you install though. Or use only software versions from before 2023.
I don’t get the fuss here. The KDE LLM policy is essentially the same as the Linux kernel. Aka human driven, human responsible, LLM assisted coding.
Unless you are running KDE on NetBSD you where already using LLM assisted code.