This carb load is not really supposed to help you with weight loss. It is to replenish the supply of glycogen in your muscles after very hard weight training without triggering an insulin response. This can help your muscles repair themselves and grow. (Of course, building more muscle mass also raises your metablolsim, which will indirectly lead to more fat loss). The slow cardio is just to help speed the glucose directly into the active muscle. (The ones you just finished working to failure with the weight training)