Meh. Body types really vary a lot. I think the whole BMI thing is vastly over-trusted. I am 6-foot-4 and currently 18.7 BMI (70KG). I was, obviously, the same height in my 20s and most of the time, at around 60KG back then, i.e. about 16.1 BMI.
Over the past few decades I drifted up to 81KG (21.7 BMI). My waist ballooned to 40 inches. Along came the T2D diagnosis.
No way to tell whether there was any association between that beer paunch, and the T2D. As my doctor said, it could easily just be genetics. But the bizarre body shape probably didn't help.
Even though my doctor didn't think so: I was overweight. Sorry, no other way to describe it. Plus, alternative measures to the BMI (such as the "waist-to-hip" ratio) judged me to be not just overweight, but "obese" -- which may sound ridiculous, but we really are all different. I had this big "beer belly" on an otherwise stick-thin frame with the ribs showing.
Nine months later, the ribs are still showing, the body is almost the same except the beer belly is gone.