More accurately diet can prevent 100% of type 2 diabetes cases, while it can be used to reverse some cases it can not reverse 100% of cases. And yes the focus on these kinds of diets is managing blood sugar levels/insulin spikes which includes sugars, carbs, starches, and alcohol.

So when you say “nearly all” that’s right...but cutting out nearly all carbs doesn’t have to be the same as low carb, or paleo/Keto, carbs can still be the main source of daily calories such as spinach, kale, romaine, Broccoli, cabbage, kimchi, sauerkraut, etc... and even higher carb foods like nuts and seeds. Those foods “are carbs” but won’t typically spike insulin and in fact many of those “carbs” will actually improve blood sugar stability/management.