I've been listening to the book " Our Magnificent Bastard Tongue: The Untold History of English." 

I find the book interesting and all of what it says makes sense to me, but one thing bothers me. The author keeps saying that everyone else is unaware or ignoring the facts he is relating. IMHO usually this occurs for good reason and these statements make me distrust the book.

It appears this author is a credible source, but perhaps he has a persecution complex or is egotistical?

Is there anything controversial about what he is saying in this book?

TIA!