I’m not worried about an admission’s officer looking at his transcript and seeing only two (as of now, three) classes. As I mentioned earlier, there are only 5 classes available for kids to take - because there are only 5 periods a day at this school. He’s taking classes there 1st and 2nd period and then heading off to take college classes for the rest of the day. His two college classes are a total of 9 credits. He’s not slacking, and no admissions officer will think that.
His transcript doesn’t show his Calc 2, Calc 3, Calc 4, Diff Eq or Linear Algebra either. That’s because those show up on the college transcripts that he’ll send.