Counting calories, using BMI for diabetes and obesity is a long failed science. In fact, no more a science but just another tool to fool diabetics into following the most horrible diet - High Carb Low Fat.
Most LCHF critics defend their carbs by saying -- everything in moderation is great. This is not so as per latest research:
Diabetics on LCHF never believed in "everything in moderation" theory. It's as useless as BMI and Calorie counting/hypo-caloric diets when it comes to reducing dependance on drugs and achieving A1C below 5.7. Only LCHF diet can help achieve this.