I don't mind if it's LLM-assisted text if everything in it is a reviewed and accurate representation of the point the author is trying to make.
But if the LLM throws in extra junk tha distracts from the conversation and the author fails to catch that in review, that's bad.
I think it's likely I was mistaken here - that the author either didn't use an LLM or used it for minor style tweaks but ensured that it was making the points they wanted to make.