Sarah is right. Many of these studies are addressing issues that occur due to being off diet or having poor control of the diet. Years ago it was believed that children could go off of the low protein diet later in life after their brain is done developing. Of course today we know that's not true, and going off of diet at any point in life can cause issues. These studies are most likely discussing the issues that people who were told to go off of the low protein diet have experienced.
Because Ace is on diet and being treated properly, your clinic is right, he will not experience any of these problems.