“...Some years ago,, my brother got an ‘exprimental’ treatment - which cured him...”
Diabetes cannot be cured. It can only be controlled.
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Yes, there is a certain segment who lose weight, control the diet and exercise who have gotten off the meds. HOWEVER, you are not cured, you’ve just managed/controlled your condition. You may very well be put back on meds as you get older as your body begins to age.
Someday, there will be a solution to this, but once you’ve crossed a certain threshold, you can only control.
FYI. I’ve had diabetes for 4 years now....A1C is about 5.6