Semi related, but i would hate to read that PDF but i also hate reading what LLMs write lol.
LLMs are pretty terrible at being concise. Using an LLM these days means putting up with bizarre and often confusing phrasing, wordy explanations, etc. It's kinda crazy to me how good they are but how bad their writing style is for me personally. Even though i use an LLM constantly i can't stand reading its responses.
Maybe it's just me, but 150 pages is like third of a good book. Quite long. And it's full of LLM slop, they did not even bother to remove the em dashes.
I'm not saying you're wrong btw; I'm sure this has many authors and some of them probably used LLMs significantly in the writing process.
I'm not saying it's impossible, but I'm more confident about winning the lottery next week.
It's probable that LLM text is pasted directly into early drafts of the document, and plausible that some of that text survives in the final document.
However, no section of the final document I have looked at reads to me like un-edited LLM output (which is almost always very obvious to me.)
Therefore, I think it is more likely than not that human editors go over the document carefully and rewrite anything that is full of the uselessly punchy sentences or constant over-corrections that hallmark LLM speech.
You can use an LLM to create work that isn’t slop. And you can hand write slop with no computer involvement at all. Most of the people I knew in high school 15 years ago would write slop on a daily basis.