Comment by QuantumNomad_

ziggy42 is both a submitter of a story on the actual front page at the moment, and also in the AI generated future one.

See other comment where OP shared the prompt. They included a current copy of the front page for context. So it’s not so surprising that ziggy42 for example is in the generated page.

And for other usernames that are real but not currently on the home page, the LLM definitely has plenty occurrences of HN comments and stories in its training data so it’s not really surprising that it is able to include real usernames of people that post a lot. Their names will be occurring over and over in the training data.