Seems there are different rules for running unattached youth/HS/open meets vs intercollegiate competition.
BYLAW 215.
A student who participates in an intercollegiate athletic contest prior to the completion of his/her eight (8) consecutive semesters of high school eligibility shall be ineligible for high school participation in that sport for the duration of the student’s high school enrollment. (See also Bylaws 600.G and 702. and corresponding Q&A’s.) (Approved February 2003 Federated Council)
QUESTION: What is defined as a collegiate track meet and/or intercollegiate competition?
ANSWER: A collegiate track meet and/or intercollegiate competition is one in which collegiate athletes are competing for or representing their school.