Alright, that's a weaker claim (that is, less of an extraordinary claim) than I was expecting. LLMs aren't quite as good as a human at conceptual originality yet, and I can't prove they will catch up, especially if thematic subtext is the measure.

I guess I'll just say my original point stands then. There's a difference between something made from a prompt by ChatGPT, and something produced from a roughly equivalent text by a translation tool.