In the end the analogy doesn't really work, because 'eternal September' referred to what used to be a regular, temporary thing (an influx of noobs disrupting the online culture, before eventually leaving or assimilating) becoming the new normal. 'Eternal {month associated with ChatGPT}' doesn't fit because LLM-generated content was never a periodic phenomenon.

to be honest, GPT-3, which was pretty solid and extremely capable of producing webslop, had been out for a good while before ChatGPT, and GPT-2 even had been being used for blogslop years before. maybe ChatGPT was the beginning of when the public became aware of it, but it was going on well beforehand. and, as the sibling commenter points out, the analogy doesn't quite fit structurally either

Yes, and this site is for everything before the slop era, hence eternal November.