I used that book as an introduction to weight training. I was also a fatty who didn't want to spend long hours in the gym so it seemed an ideal choice (Darden's books generally target overweight, sedentary Americans, who can't afford to exercise too often and can't comprehend complex nutritional strategies). After some initial success, I soon found the calorie restricted plans oppressive (Darden recommends going as low as 1200kcals).
This, coupled with the low fat/protein and high carb split, made life unpleasant and hunger a constant presence. I lost weight but I'm certain also lost lean mass. Only when I switched to a keto approach did I experience a resurgence in strength and positive change in body comp.
I have huge respect for Darden but, putting aside the HIT versus HVT debate, the nutritional element is naive and I couldn't recommend it to anyone.