I think writing fiction with LLMs is fine. "based on a true story" or roman à clef fiction is also fine. I would have no objection to this if it were clearer that this was a "movie treatment". (As LLM fiction goes, this isn't even all that bad.)

However... Look at this HN page! Not a single person here realized (before my still-downvoted comment) that this was a 'movie treatment', or that the 'quotes...were also mostly spat out by the LLM as well'. They all are taking it as 100% gospel, and engaging with it in good faith, as if it were genuinely a 'technical post-mortem' (as it takes pains to present itself) instead of your fiction-writing hobby,

Just make it clearer that this is a fictional story.

> I'm curious if you consider having a ghost writer to be lying, or a cinematic re-enactment

Yes. This is why ghost writers are supposed to be credited as such if they are contributing non-trivial content rather than simply serving as a amanuensis or an editor, and cinematic re-enactments are flagged as such if it wouldn't be obvious to a reasonable person (by reputable documentarians, anyway).

I'm used to quotes of phone calls in this kind of thing being an approximation.

If that's the biggest issue, and the story matched the detailed notes fed into the LLM, I wouldn't call it "fictional".