Bowles, does he say which "flavours" of Crohns his products will help ? Because if he is not specifically addressing the fact that Crohnies have wildly differing safe diets and digestive abilities, then he is pretty much just peering through a keyhole into a darkened room....at best.
The salesman's term "you can" is not -
not least for legal reasons ! - "you will". Yes, the products will help some people. So will not eating at all, or eating nothing but bananas, or Ensure. The burning question is how many, and how good is the logic behind the diet ? What are the long term effects ? How well supported by the patients' findings are his ideas ? Things like probiotics that work particularly well will be taken up rapidly by CD sufferers simply because they so obviously work. Things that work less effectively may linger because they work for a minority, or vanish only to be reborn as the next new idea.
I know nothing of Josh Golder, so there is nothing specific I can tell you that is bad. From what you say it sounds like a pretty basic convalescent build-back-up high protein diet, with added-profit marketing aids; but of course the devil is in the details. If I had the money to try such a thing, I would certainly consider it, but I would also run it by a good dietitian experienced in intensive care cases who could advise me what sorts of nutrients a person with a damaged gut might run short of.
Personally, I think that avoiding sugary foods is just a basic good idea for Crohnies, same as it is for most ill people, and everything else is try it and see.