It didn't seem LLM-written to me until "The Operation" section. After that... yeah, hi, ChatGPT. Still an interesting story, even if an LLM was used to finish it up, lol.
I think that's because up until "The Operation", it's basically just paraphrasing the input. "The Operation" is the exact point it finishes doing that and - no longer having as much guidance - decides to start spinning its wheels making up needless, ling winded slop.