Because it's unlikely you can make an autoimmune disease not happen just because of a weight loss.
I might stall the decline in active b-cells and am, and intend to continue, trying my darnedest. I don't plan on managing my diabetes any less actively because of this result - however, I like to have realistic expectations. At some point in the future, my body will have eaten the beta cells. Actually, it is already well on the way. That's a shame. Doing the best I can, I can probably delay it by x years. I can't prevent it entirely.
For others who are type 2 and don't have 500+ in antibodies, I'm absolutely certain that the outlook is a lot better for a long, long period of remission/diet only management etc.