Beano,
I am afraid you have come across the NHS's lowest common denominator approach.
Firstly, losing weight and getting more exercise is the most productive way of improving the BG control of Type 2 diabetics in the majority of patients. The 'Education' has to be pitched at a level that is within the grasp of the majority of participants.
For example, on the X-PERT course, when they are explaining what diabetes is, they talk about cells being 'fat' and needing more insulin. That is an attempt to explain the biochemistry where it is the presence of free fatty acids that interfere with the protein cascade that is triggered by insulin.
As for low carb, high fat diets, the difference between unsaturated fats and saturated fats is a tough one for many - hence the current NHS message.