But as a non STEM kid, maybe he needs to focus on making sense of the ECs. Best way to stand out for poli sci is to get experience volunteering on a campaign or in a rep office. So many kids do not do this.
OP, it’s not about a count of xx big things, with titles or awards. You have a lot of music, which you’ll likely need to condense for the activities section. 80 hours recording music isn’t the sort of community service top colleges want- they like real community engagement, hands on, outside of your usual comfort zone. Starting a biz is not, in itself a tip (and it sounds like a solo experience.) Despite not wanting stem, you have AP comp sci planned, physics C. Etc. And as said, your stem scores are stronger than the others.
I think adcoms may be confused what you really want. Breadth is great. But this feels like a jumble. I think you can stop, rethink it all, and improve it. You want to learn what the different colleges value and decide how you can show that.