I don't know your exact question, but I am betting this is just a rephrasing of a post that exist elsewhere that it has crawled. I don't think it saw it so much as it has seen this list before and was able to pull it up in a reword it.

Nah, GPT is capable of halucinating stuff like this. Also seeing something once in the training data is afaik not enough for it to be able to reproduce/rephrase that thing.

A lot, but that's irrelevant to what we're discussing here in that AI in its current form has no intuition or semblance of original thought.