I think that is fair- I can't judge whether it is a tough book, or a poorly written book, or an unusual book even. I still however this this comment is unjustified assuming "bad book" means bad in the all-encompassing sense:
> Honestly it's a bad book and people would be better off literally just reading the Quora question and answer that inspired it.
I therefore can't recommend his books in any form. You can get the gist of his ideas from his videos.