The article title over-sells the incomplete state of their knowledge.
According to the late Dr. Robert C Atkins there is already a cure for juvenile diabetes, at least in some cases:
“To give you the flavor of the exhilarating satisfaction I get from practicing this new kind of medicine; listen to the story of my patient Marie Speller. An eleven-year-old who had been recently diagnosed with juvenile diabetes, she had been prescribed two varieties of insulin. Doctors are traditionally taught that juvenile diabetes carries with it a life sentence requiring insulin. However, I had learned from treating other diabetic patients that if one of the lesser-known vita-nutrients, calcium AEP, is given during the first year of this illness, the illness can be reversed. I put Marie on a vita-nutrient program, and we were able to lower her insulin dose, week by week, until six months later she stopped taking the drug completely. Her blood sugar levels were virtually normal and have remained so for the past two years, at which time her pancreas responded to a carbohydrate meal with a normal output of insulin.”
from “Dr. Atkins’ Vita-Nutrient Solution : Nature’s Answer to Drugs” by Robert C. Atkins, M.D.
IMHO, I think it is more likely the kid had a genetic variant for MODY, Maturity Onset Diabetes of the Young.
I used to work with a woman that could list off the nutritional supplement cure for practically any malady, including type 1 diabetes. Really annoying. I learned to never discuss health issues of any kind with her. For every disease or disorder out there, including mental ones, somebody is convinced there is a nutritional cure for it.