As for being 9 at the academy, I wouldn't want to send my son that early (who is now 7). He might be academically ready but he is not physically or emotionally mature enough to sit through a college class. He would need the academics from a teacher who understands that he still needs to wiggle a little. He simply wouldn't be able to be in a class with 16 and 17 year olds.
Interesting. So maybe they're looking at the "whole child" being at least jr. high age? You'd need the organizational, writing skills, maturity, and patience of a 7th-8th grader as well as the academic piece for a good fit? I am a bit surprised as well they don't accommodate more younger students.