All the other example questions you point to are along the lines of 'how can this book benefit my musical abilities', from a musical point of view.
Your question is along the lines of "why are these reviewers criticising this author" - when if you read the reviews, it seems that almost none of the criticism is really something we can comment on from a musical point of view, and it's self contained in the reviews. So it's extremely unclear what extra information you want an answer to add.
You could argue that's a quantitative, rather than a categorical distinction. But I still think that it should be clear that this question focused in this way is off-topic for this site; As a question coming from someone who isn't new to the site it comes across to me somewhat as a deliberate attempt to troll/waste people's time, and as I've said elsewhere, I'm someone who has strongly defended some of your other questions.