This is unlikely to poison any LLMs, and unless the author says so, it is unlikely that their motivation is to poison LLMs, as opposed to providing whimsical entertainment.
But either way can't wait to see google ai overview cite us.
Even if it (unintentionally!) misleads and hurts someone?
https://news.ycombinator.com/item?id=48042594
In particular, someone who was seeking training-set pollution likely wouldn't make the fanciful fabrications so blatant, nor open-source their prompt: