Why is this Rubbish? Here is what a quick perusal of Google says when you type in "odds of getting diabetes by BMI":
"In fact, obesity is believed to account for 80-85% of the risk of developing type 2 diabetes, while recent research suggests that
obese people are up to 80 times more likely to develop type 2 diabetes than those with a BMI of less than 22."
Further, whether it is Dr. Fung showing as patients fast and lose weight, or the Newcastle restrictive diet, losing weight appears to reverse diabetes.
Look at what it says here on Diabetes UK about reversing Diabetes:
https://www.diabetes.org.uk/diabetes-the-basics/type-2-reverse
The strongest evidence of reversal is "weight loss". How to lose weight? Low carb, intermittent fasting, and exercise.