Meh, I don't know if I would consider 0.7 grams per kg of body weight a "low protein" diet. Compared to bodybuilders or most athletes maybe, but that is right around the recommended amount and what most "normal" people get on a regular basis.
Also just to note, it doesn't say it won't have these same effects with a high protein diet. It is just that, that diet was not studied. I would be very surprised if the Invalid Link Removed were negated by a high protein diet.