1. That guy probably gained the 22lbs in 4 months, becasue it's loaded with Carbs.
2. Adding Milk will improve nutrient profile and thicken it up, but it will also increase Enzyme production add more Casein and make it take longer to digest and also increase Carband Protein levels more, when you don't need to, thus potentially causing more fatty weight gain.
3. 50g Protein per serving is not necessary after a workout.
Frankly I'd avoid using that, unless you want a potential Beer gut that wobbles when you use the Treadmill. It's loaded with too many Carbs, too much protein and they reccomend increasing the Carbs with Milk. It's got 152 per serhving it needs less not more.
It also doesn't tell you how much of the ingredients are in it and I don't mean the Protein and Carbs. Some supplement sites do, that doesn't. No gold star for that I'm afraid.