Frankly, very disappointing. Statements like these have no basis in fact, and it only causes me to view the people who make them as misinformed and less credible.
Fact is: the more fast acting carbs you consume, the more complex it is to manage your BG as a diabetic. There is no one "right" or one "wrong" way, however. It's a matter of choice. You can get the proper nutrition on a low, medium, or high carb diet, and it's really up to the individual to decide how best to adjust the other variables of insulin and exercise to achieve optimal BG control and health.
Bread, pasta, rice, french fries, donuts, cereal, bagels, baked potatoes, etc.. - I love them all, who doesn't? They taste great, no doubt about it. But if I eat them, BG control becomes a roller coaster ride, so I don't. Suggesting that these foods are nutritionally necessary, however, is incorrect.