Cure is like curing cancer. It is gone and won't return if it is cured. Compare that to celiac disease, where you're permanently sensitive to gluten. Does not eating gluten cure celiac disease? No, it is a treatment. When you stop following the treatment, the disease will return in full force. The symptoms might be in abeyance but the disease is still there.

Treating insulin resistance or T2 diabetes is a treatment. Just like following a gluten free diet isn't a cure for celiac disease, it is a treatment. You stop the treatment and the beneficial effects go away.