This. Also, something that is not mentioned anywhere in the post: internally, StackExchange as a whole has been deeply and continously questioned by users, with longstanding moderators quitting in the last two years. Changes in how content is licensed and how the network is managed have caused repeated outrage on users. So, SE is asking for money instead of blocking LLVM usage (as reddit did). Aaaaand AI-based answers are still banned due to them not disclosing their source.
The fact volunteer-based moderation got more stranded by AI-sourced answers, making revision more time-consuming (with a lot of scaffolding around blatant false answers) surely adds to other things mentioned across comments (people being laid off, people using other sources, people too lazy to care about peer reviewing).