Lol, seriously? Not to bust your chops but you're nitpicking and playing with word semantics.
It's not "nitpicking". It's pointing out that the description of the book on Amazon contains incorrect information. If the details in that description were pulled from the actual book (as such things often are), then the book is wrong. This would suggest a lack of research with regard to the actual event. It's the sort of thing a critical reader would be looking for.
It's the difference between reading something and saying, "Wow, cool, I believe that because it's printed in a book" and saying, "This doesn't seem right, let me take a closer look at it."
Different levels.