While I don't have the book you are refering to, I got a free copy of his book "The Maker's Diet" from the Vitaminshoppe, for some reason, they were giving away the hardcover version of this book several years ago. I actually got this book before I knew what Crohn's or Colitis was.
I don't think he has much new or exciting to say. His approach is sort of a modified SCD diet and a forum for him to sell his very expensive products. His story is somewhat inspiring in the book I read but there is not much substance on getting better. If you want to try his approach without all the obfuscation, filler and sales, google "paleolithic diet" and stay on that for a couple of weeks and take a good probiotic like Primadophilus.