I did the 800 calorie diet as it had been tested, and seemed to actually reverse my diabetes. I lost weight slowly beforehand, which didn't show the same improvement.
I think the acid test is can those who lost weight slowly eat a balanced diet now, as I can, or do carbs still peak their BG.
I suspect we could get bogged down in what a balanced diet is, how it doesnt work for everyone, how lc is better, how diabetes may still come back, but, at the end of the day, it was the 800 calorie diet that reversed, not controlled, my diabetes.
But that's just me.
I had one chance, I made my choice.