Joel is an interesting character as he advocates a low carb plant based approach, which can obviously work for lowering blood sugars. This puts him sometimes into conflict with some of the hierarchy (a good thing in my view), so personally if this was my way of eating I would give his method a go.
Dr Gabriel Cousens has similarly come under fire at Plant Based events for advocating a low carb approach to treating diabetes, so again I like him. Also he has a documentary on YouTube that shows (for once (any more results?)) results:
These are groups I am a member of for low carb plant based methods (I always conduct impartial research for understanding). The pinned documents are excellent for anyone doing Keto.
Vegan Keto Made Simple
Vegetarian Keto
The above are not my recommendations as I eat in an alternative way, but are for information.