Go to the PG site and look for yourself. Look up a player you know and you can see what is posted about him. You will not be able to see everything but get a good idea.
Your son will be evaluated at the showcase and get a grade plus some comments. There will likely be a video made of him pitching or hitting or fielding. These will stay with his profile. After this they will show what tournaments he has entered along with any commentary that comes out of the tournament, such as hitting or pitching performance. He something exemplary happens it will be mentioned. If he is a pitcher then his velocity range will be recorded with some commentary on his pitches.
Don't worry too much about the grades, etc just have him do his best. There is some variability in the numbers and comments but it is a great way for a coach to track his performance as he develops and competes in their events.
Also us parents get all worked up about little comments or something in the profile or comment in the tournament. Relax and just remember it is one tool that is available for coaches to evaluate and track your son's performance. They will be interested in what they see not what is in his profile.
Good Luck!