Nope if you take one of those tablet's your grounded for a period until they can see your stable and not prone to going sugar low. Even if you then come off them again. One shot of insulin and it's three months grounded minimum.
Hence being given time to control it via diet. Medically I don't think they have a clue with class ii diabetes. It seems to me there are multiple things going on and various conditions which give the same symptoms. Currently they have a one size fits all treatment plan. Who is to say his condition is anything to do with his pancreas. Insulin resistance, fatty liver leaking glucose due night time hormones.
To me the recommended diet is just throwing fuel on the fire while trying to put it out.
Most doctors seem pretty clueless about it to be honest.