It's a 400 page book that came out a few hours ago. I doubt anyone unconnected to the author is in a position to comment on its contents.

(But plenty of people have noted the previous volume was worthwhile).

The author's published material is very well known (and appreciated); in a positive and paradoxical sense, "there's nothing new under the sun".

The content is also extremely technical. I don't think in itself is "easy" to comment (at least, not in early stages).

What's new, in a negative and surprising sense, is how little the author is profiting from the books.