No, I think it is the work of many dozens of people, not one person.

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.

So your complaint is about LLM slop, but can’t point to anything that’s actually wrong about it other than that there are dashes?

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.