Ok before I was diagnosed I have dieted . Those diets I have been on recommended 800 Cals . I did take weight off doing them but not as dramatically as the ND. They definitely didn't make me ketogenic. My normal calorie requirement is normally about 1300 (which in most men would be a low cal diet ). See the problem?
I think whatever "diet" we adopt, for those without additional metabolic issues, those with more excess weight existing at the outset are likely to lose fastest once they either reach their own calorific deficit or discover their "magic formula" for weight loss. I use "magic formula" that way deliberately as some folks have found that getting themselves into dietary ketosis ( as opposed to ketoacidosis) means, for them, they can lose weight whilst consuming more calories than they might expect. For them, this often means low carb, with increased fat consumption.
I am still unclear about what you are actually trying to achieve with your weight loss; whether it is a general trimming up, or some additional action on your diabetic condition.
There appear to be a great many ways to lose weight, and almost as many ways for individuals to control their blood sugars. I think you have to decide which you feel most comfortable with, but if all you want is a miracle, quick hit, quick fix, then I would urge you to think it through. For the vast, vast majority of folks who manage to get their weight into a great, healthy place and rein their diabetic bloods firmly into the non-daibetic ranges, there is a maintenance regime required. Yes, there are a number who appear, to have crossed the diabetic Rubicon and post-diet, can eat, drink and be merry like someone who can't spell diabetes, never mind be diagnosed as diabetic, but they are in the minority and I would be concerned if their position was your sole objective.
You don't give me reason to specifically believe that it is, but nor do I understand what your objective is.