It's not a bad diet, but you can't change your belly by what you eat. If you'll stick to this program and work out, I guarantee your belly will get flatter. Also, if you'll do any other diet and work out, the same thing will happened - as well as flatter ass and nicer thighs...
There's nothing we can do to target weight loss in specific area of the body. The name's just a good selling trick.
