As I said, the actual remark I made is independent on whether this article was written by an LLM or not.
It's still pretty obvious to me that it was, but I'm not sure what kind of "proof" you are looking for, you know as well as I do that it can't be proven one way or the other, so who cares?
Unless you can show me some sort of "proof" this is LLM writing, it doesn't read that way to me. And I read a lot of obviously LLM-generated content. I'm 100% sure it was cleaned up by an LLM, because I don't see any glaring mistakes (grammar, spelling, article mistmatch, etc.). But it doesn't have that "prompt-> article" AI-slop feel to me. And some of the lines, like the ice cream frog being boiled, are things you'd never have an LLM suggest.
IF you can "prove" otehrwise, I'm all ears (eyes).