As far as I can tell this is entirely hypothetical and he hasn't actually received an AI generated MRs.
For a couple of bucks I can drown my own repos in low quality slop, so I don't need some well wishers to do it for me.
As a matter of fact I have yet to see an OSS maintainer that accepts AI generated slop MRs.
https://news.itsfoss.com/curl-ai-slop/
https://www.theregister.com/2024/12/10/ai_slop_bug_reports/
https://biggo.com/news/202508220113_Ghostty_Requires_AI_Disc...
If you can't code, don't code and try to contribute to OSS projects. Claude or whatever trash one uses to make this outburst of garbage is not a substitute for skills. Don't waste mainteners' time and attention.
It's not 100% automated. The worst I've seen so far is 98% AI generated code from a real person. They write and submit the MR comment.