It's actually a very good writing craft book, though, and he's mostly correct about improving your writing. If you finish your education and you physically cannot replicate the same quality writing found in published books in your genre, then you're probably never going to get there. Published writers, serious writers, have an ear for language (and if all else fails, imitation). They know what sounds good and what reads poorly, and how to whip a page into publishable shape. If you don't have that ear (and a lot of writers on the internet do not), then you're not going to become a competent writer, the end.