I’m unsurprised that a large component of the treatment is effectively just “lose weight”. For many years I’ve heard accounts of significant weight loss reversing type 2 diabetes.
It does seem to work for some. My sister was in that grey area of pre diabetic to type-2 and she dropped a lot of weight (30kg), started eating whole food and skipping fast food, and it completely reversed when she got back to a more ideal weight. She knows though that if she goes back to her old eating habits that it will come back