Bitch is clueless and way too general, like all of us fit in the same 'standards', how theoretical.
Regarding protein need, it depend on things like the intensity, volume & frequency of your training, amount of lean bodymass, if someone is on gear or not, type of job, recovery, etc, etc...
Regarding 'extra calories', it's about the protein dumb bitch.
Regarding kidney damage, only by enormous amounts of protein, has nothing to do with their sources. Drinking more water helps to prevent this
Powder is convenient stuff because it's compact. I only drink a shake after training but prefer to mix the powder with oatmeal.