clarinetdad16: the key in the link you provided is “after graduation”. As long as a student takes college classes BEFORE HS graduation, s/he’s considered a freshman applicant, who will then get advanced standing.
This is the situation everywhere in the country so that students try to challenge themselves. it’s also a good “risk free”/risk managenement policy for colleges: they want students who’ll graduate and they best predictor of sucess in college is -surprise! - previous success in college classes.
Note that the most selective universities don’t do this because their first-year classes are roughly one year above that level and they assume this previous knowledge/level of skills from their HS admits.