Firstly that’s BS. You just build up to it.
Secondly. It’s not about not eating carbs. It’s about training when your stomach is rumbling first thing in the morning.
Fifthly. Taking protein supplements when you want to lose weight is stoopid. Get your calories from proper food.
Firstly, it sounds like he is doing quite a lot of exercise already, so over reaching is quite possible.
Secondly there is no evidence training on an empty stomach first thing in the morning actually makes you lose fat any quicker.
Thirdly, if he is doing weights there is nothing at all wrong with a higher protein diet, or getting it from a good quality protein shake.
OP, if you are doing more weights there is every chance you are putting on muscle at the same time as losing fat so your scale weight will stay roughly the same. The only definitive way to measure it is by using skin fold calipers. The more muscle you have, the more fat you will burn so keep it up.
For losing the last bit of fat (if it is that) try carb cycling. Have a read about it, its what bodybuilders do to get their body fat as low as 3%, I am pretty sure it will help you but you have to be very strict with your diet.
Have a read of these links, there is plenty more on his site about fat loss, fitness, and bodybuilding, and is probably the best of its kind on the net.
Gain Muscle and Lose Fat At The Same Time!
Advanced Fat Loss Carb Cycling