That’s not it in this case, because the book is mostly a recounting of what happened. I narrowed it down to two things: One is that every aspect of the story is treated equally - unimportant facets get an equally profound sounding prose like the really important bits.

And the other one is the repetition of phrases. Everything is worth slowing down on.everything is load bearing. That’s so annoying.

Right, that's the sort of thing I meant.

As you read it, you would naturally try to understand why the author used such profound-sounding prose in that particular part of the text. You would expect that the author's intent was to emphasize the important bits. When the author talks about slowing down or something being load-bearing, you would expect that they're going somewhere with this, that this particular bit is especially important in some way.

But with an LLM-generated text, these attempts at understanding will get you nowhere and only produce frustration. The reader is left trying to interpret a signal that isn't really there.