I consider my husband's type 2 diabetes to be reversed. He used to eat food that I/we now know is unhealthy. He now eats a healthy diet, as do I. As a result, he is no longer ill. All symptoms of diabetes have gone, inappropriate "numbers", thirst, tiredness, depression etc and his retinopathy has, to quote his ophthalmologist, "regressed" in a way that he considers "amazing".
Of course, if my husband were to insist on eating an unhealthy diet, he would become ill as so many of the population are doing on a daily basis.
As for the suggestion, which some might make, that he (and probably me too because I'm not used to it) would "fail" a glucose tolerance test, neither of us would anymore drink a glass of glucose solution than we would consume a glass of cyanide - irrelevant, it's just not what we do.
Sally