To be honest, what does it matter is a long term carnivore managed to eat themselves to obesity and develop T2? Are you planning on devouring as many cattle, sheep and pigs as you can get your hands on and testing it out?
Given almost any situation there will be exceptions to the "rule", and the thing about diabetes is the "rules" tend to be quite fuzzy around the edges.
Personally, I chose to focus on learning how I could manage my own condition, to get myself into a better place metabolically. I learned a lot along the way and have become involved in research in various ways, but I accept I will never have all the answers, and some answers are likely never to be known for certain.
Anyway, for now, I'm going to get the mower out and get the lawns neatened up, whilst waiting for a couple of new shrubs to be delivered. I know that's good for me. The garden is one of my happy places, which reduces any stress, improves my insulin response and it'll add a few paces to the daily tally. For me, it's about living my best life, and hoping life doesn't throw me too many curved balls. If/when it does, I'll just have to regroup and go again.
Life's too short to try to understand every nuance of everything, when there are adventures waiting to be lived.