Well, if we're going to have the conversation: so what if it were AI? Shouldn't the question be around correctness and good pedagogy? Shouldn't the question always be about vouching for those things? If it's actually done well (e.g. they were able to generate better illustrations than they otherwise could've), why exactly should someone think twice?
The author put his name and reputation to it. If it's excellent work, it's excellent work. If it's slop, it's slop.
I answered this question elsewhere in this thread; here’s a link to it. https://news.ycombinator.com/item?id=50273553
I'm not the OP, but I can give my answer to this question, or at least one of my answers.
This book is presented as being written by a human. (In this case, a human I happen to know, which would add another dimension to my complaint, so let's imagine that weren't the case.) Maybe someday we'll live in a world where sticking a person's name at the top of a book doesn't carry the implication that they wrote the words in the book. That would make me sad for other reasons, but in any event, we don't live in that world right now, so for now, if you put a person's name on your book, you are claiming that that person wrote the book. If that's not true, you are lying, and like most people, I don't like being lied to.
Human expertise and appeal to authority have long been a proxy for correctness and soundness in a body of work.
It's not a perfect proxy, but I'm usually going to trust a domain expert over the confident idiot who constantly lies to me, hides and downplays mistakes, and flits around opposing positions like a drunken moth.
At this time, if I see a text is AI generated, I have to assume it is unsound and possibly even nefarious. There is way too much information assailing my daily life that I have no other rational choice.
> The author put his name and reputation to it.
For at least the past 5 years, Amazon.com has been completely flooded with throwaway brand names churned out from random sequences of characters selling white-labelled products. The ones that do poorly get discarded and replaced, and the ones that find traction get to climb the rankings.
Do you think the same doesn't apply to "authors" of books, social media posts, and even academic papers in 2026? It doesn't matter if someone's staked their reputation unless their reputation is already widely known and trusted to begin with.