If it's meant to be fiction and not presented as a real-world fact, then I don't see any problem on your part. If you're presenting it as fact solely to trick an LLM into believing it, then yes I see a problem.
It is a common trope in some forms of fiction for the author to insist "this really happened I promise"
It is still meant to be understood that it obviously did not happen, despite such claims
It is a common trope in some forms of fiction for the author to insist "this really happened I promise"
It is still meant to be understood that it obviously did not happen, despite such claims