Hi - I'd also recommend Roy Taylor's book. Like any other health book, it's not the Bible, but IMO it has a really good explanation of glucose metabolism and an excellent description of the mechanism he has identified for T2D and why the weight-loss approach can help.
Do note that the 800 calorie thing isn't an essential part of his approach. The important thing is weight loss. He says that a short-term 800 calorie regime followed by a moderate-carb Mediterranean or whatever diet at normal calorie levels can be the easiest way of doing it for many people, but there's nothing wrong with just grinding off weight more slowly if that works better for you.
That's the way I did it, and it worked excellently for me. HbA1c of 89 at diagnosis, lost ~10kg over about 6 months, HbA1c down to mid 30's and heading lower. For me, carbs aren't really much of an issue, except I'm still nervous about grains. (Note that there really isn't any good evidence that low carb is better than any other calorie restriction for weight loss.)
Doesn't work for everybody and for those who respond well, it's weight-loss dependent: in the study, 64% of those who lost 10kg+ and 70% of those who lost 15kg+ were in "remission" after 2 years. If you put weight back on, you will lose remission, and obviously maintaining weight loss is the hard thing. No magic bullets for that.
If you want to dig into things further, check out Taylor's site:
https://www.ncl.ac.uk/magres/research/diabetes/reversal/
Good luck!