I have come across Bernstein, seen him speak. Either he is wrong on T1 or you are misunderstanding. As Helly Medic states, do not confuse insulin use vs diabetes type.
I have T1, dose of flu, rogue t-cells, borked beta cells. I may have some residual insulin production but not a lot.
Bernstein is correct on T2, whether using insulin or not. All of those factors I mention, including very low carb diets may remove the need for insulin, and may put the T2 into remission. That will however not work with T1, we can reduce but not eliminate.
As HM says, the distinctions may not always be clear, in my case however, it is crystal.