I am not familiar with these specific events or the organization sponsoring them, perhaps others in the PA/NJ/Mid Atlantic region are. I am familiar with other, established brand name events where coaches are in the dugout and on the field - Stanford Camps, HeadFirst and Showball. All are very good, if your son has skills to display and will stand out. Beware of the following:
1. Many of these events are really geared to exposure for pitchers; luckily, my son is one and benefited from that. I may be biased, but it seemed to me that most coaches were focused on games where a player that they wanted to see was on the mound. At least, in any case, it was easier for Ps to stand out.
2. These coaches will be paid to attend, and for some (volunteer assistants), this and money they get from their own camps, is about all the income they have for coaching. So, they may well show up and "mail it in". They will typically be focused and paying attention when there is a specific player on their radar is participating.
3. Many of the coaches who attend will likely be more junior (ie, not the head coach and/or not the recruiting coordinator).
It also matters how skilled the team your son plays on is. My son played on a team that was loaded with all eventual D1 commits. The more talent, the more coaches who will flock to watch and will increase the chances of any particular player standing out.