Source me on that. Show me a spoofy historical comedy written seriously where the author defends it as historical fact. I think it would also be fair to say you can't use a religious or cult text (i.e. Book of Mormon, Dianetics), since those are being presented as legitimately non-fiction, and it has to be presented as entertainment (so no pseudoscience cranks), since that is the main purpose of fiction (beyond disinformation and religion, of course).
I'm going to guess that you can't, since what you have presented is a logically impossible loop.