Earlier quoted context omitted.
The biggest mistake, AI or not, is dropping a 10K+ PR. 300~500 LOC is how far one should be going, unless they're doing some automated refactoring. E.g. formatting the entire StaticCompiler.jl source. This should've been a distinct PR, preferably by a maintainer.
I've seen this in other places as well. The bottleneck is not coding or creating a PR, the bottleneck is the review.
It could first judge whether the PR is frivolous, then try to review it, then flag a human if necessary.
The problem is that Github, or whatever system hosts the process, should actively prevent projects from being DDOS-ed with PR reviews since using AI costs real money.