@CurlyWurly
Have you seen these recent videos of Roy Taylor addressing GPs:
this and
this? I think they go a long way to answering your questions.
As I understand it, a summary is:
1. Lose sufficient weight [8-20+ kg] to put your diabetes into remission [ideally 'full' remission with HbA1c < 39/42 according American/UK standards]
2. Maintain your new low weight by eating 75% of what you used to eat [Roy Taylor's advice] or following a low calorie diet [David Unwin's diet and the others I mentioned as well as anecdotally numerous members of this forum]
3. If you achieve 2, you may well be able to avoid any recurrence of prediabetes or T2D year after year, but there are not yet any longitudinal lifetime studies to prove or disprove the point.
If you read all of Roy Taylor's papers you will find the one describing how the pancreas was observed to shrink just before the onset of T2D (ref not to hand).
Other than that I suggest you have a good look at the technical article you quoted:
https://pmc.ncbi.nlm.nih.gov/articles/PMC8247294/
One of its conclusions,
These data demonstrated that the profound pathophysiological changes underlying reversal of type 2 diabetes do not depend upon a continued hypocaloric state but rather are durable during normal eating.
The $64 question is what does
normal eating mean for each of us. My own view is that a diet with plenty of pasta, potatoes and flapjacks is a high risk interpretation. Better to stick with low carb proteins and vegetables with occasional excursions into 'enemy territory' as Harbottle's posts in this and other threads describe.
I don't have a CGM but, if and when I do, I will use it to explore what foods to add to my menu. Meanwhile I plan to take advantage of Jonno Proudfoot's RMR Cookbook to improve my culinary repetoire.