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How To Learn Any Language Books
Learning a few languages doesn't necessarily mean you know better than others how to learn one. Or you may have grown up in a multilingual environment that made it easier for you to learn others. Or your definition of "fluent" is less stringent than what others use, so you aren't as good as you project.
Still, there are legitimate polyglots who have successfully learned several languages and can properly put that experience into a useful format for others to use. And they may not be the ones that point to themselves the most.
So when looking for such a book, don't necessarily be lured in by a big name with even bigger claims. A lesser-known name just might be the one to give you the insight you need to reach your language goals.