I think that the comment about CTY minimums was intended to illustrate what a major player in advanced and gifted education considers to be exceptional ACT scores for a 7th grader.
However, these scores have little relevance for OHS purposes. To be blunt, if you can only score the CTY minimum, you probably do not belong at Stanford OHS and will not have a good experience there. I think about 30-35% of the graduating seniors, for example, score 800 on the SAT math section, and the overall 25-75 for the group is 1440-1560 (so fully 25% of the outgoing class scores in the top 0.50% of SAT takers).
Many OHS kids participated in 7th grade talent searches, and qualified for SET (over 700 on either math or verbal SAT or both prior to 13th birthday). Academically, OHS classes are quite a lot more difficult than just about any other high school out there. One look at the curriculum, which includes for instance five years of math available past BC Calculus and at least two years of physics past AP Physics C, will tell you that this is not an ordinary group of kids.