Here is why:Why would you say no? From the website you listed,
According to NCAA rules, however, any kind of workout you attend on an official visit cannot be organized by the coach or coaching staff. Typically, the workout will be led by the team’s captains. Take this opportunity to see if you connect with your potential teammates.
I don't believe the coaching staff can watch these workouts either, as Dad implied. But I am not a recruiting expert.
I just recall there was a dust up several years ago when it came out that Self's office just "happened" to overlook some basketball courts where the team would play with recruits.
http://www.ncaa.org/student-athletes/future/initial-eligibility-rules-involving-tryouts