There is a section in GCBC where he explains some early research on insulin and blood sugar that helped convince all the diabetologists that everyone should be high carb.

The study went something like: if you constantly snack on carby food, insulin can be relatively lower and blood sugar can be stable without BS highs or crashes - but at the expense of storing fat the whole time. (Note the use of "relative" in the study.)

These researchers are coming from the point of view that fat comes first and then diabetes and insulin resistance follows, and are interpreting the data from that light.