Does he know what he's talking about?

You need to pay attention to the distinction he is making. If you just eat protein, but do not work out, you will simply become overweight. It is the act of exercising of the muscles that build muscles not the act of eating. That being said, you need protein and carbs to feed the energy those muscles need to allow them to grow following a work-out.
 
Yes, what he says is 100% correct BUT you have to understand what he means by "excess." If you eat perfectly (which is almost impossible), then you don't need to eat anymore protein than needed. Since we are not hooked up to a machine 24/7, we will either over or under eat nutrients (protein). The excess protein could be used as energy as well or disgarded as waste or stored as fat. Now, if you crank up the time in the gym, you should adjust your diet to compensate for more energy used.

for example, lets say that you weight 180 lbs with a Lean body mass of 150 lbs. Some people recommend 1g of protein per lb of bodyweight or 1.5-2 g of protein per LBM. If you eat like 3 g of protein per LBM, guess what... you are most likely going to build some muscle but some fat as well. If you eat 1.5 g of protein per LBM but not enough carbs and calorie, the body may use the protein as energy and you may not be in optimal muscle building phase (anabolic).

In short, while building muscle, you are going to gain some fat. In general, keep your body in calorie surplus with 1-2g of protein per LBM (lean body mass).
 
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