I think we are in violent agreement, everyone can and should be suspicious of anything they are being old by an" authority" or not, though clearly evidence based authorities count for more.
My only concern with your post was that the way I read it you had effectively singled out those that had actually achieved full success on the journey including reaching target weight goals.
What is very clear is that with an initial diagnosis of diabetes , there are things that individuals can do through diet, all well explained by Daisy that will put them in a much healthier position relatively quickly, including reduced blood sugars, improved lipids and weight loss which moves them to a much better position than they began including their vulnerability to all manner of troubles which may or may not include some cancers
Some people will be lucky that this switch is enough to get them back to normal weight and normal insulin resistance as well. For many of us, including me, it won't and we will still find ourselves searching for new inspiration to get to that final stage. As such if anyone does try out something different and is prepared to share their experiences of it, I for one will be very grateful of any reports of the results - good or bad.
In the end all of this is down to what works for each individual. That will be combination of whatever the underlying science is- which may or may not yet have been discovered and the personal traits of each person.
Sometimes it can be hard to convey exactly what we mean and so it seems here. peace!