Yes. Your pancreas would need to be replaced to be cured. The insulin receptors are damaged or dead. When they reach a critical level for your weight, you develop type 2 diabetes. They do not re-grow. Therefore the only cure would be to replace your pancreas. Remission can be achieved through diet (keto is best), intermittent fasting, bariatric surgery, weight loss (so your remaining receptors can handle the load).
I don’t think they have scientific evidence of what you say. There may indeed be people with damaged receptors, but I don’t think science has fully understood or proved that.
There is some evidence stem cells migrate to the pancreas to replace lost beta cells. It comes from an intermittent fasting approach from a couple years back.
I’m heading to bed now, but yes, it is possible to regenerate those cells.