“No s/he won’t. As the OP originally mentioned, (and I missed the first time), AP Spanish at his/her HS is 5th year.”
AP Spanish is the fourth year of language at the HS, it’s considered Spanish 5 because the OP started with Spanish 2 as a freshman. The selective colleges (as the Columbia AO confirmed) want to see four years of language taken in the HS, ever year, as long as the HS offers them or you’ve taken the AP language earlier. You can start at Spanish 1 and end up Spanish 4H as well, as long as you don’t drop it, it’s fine. As I’ve said before, I’m not a fan of loading up on APs so I’d call the USC/BU office and see what advice they give. For Columbia, e.g. its clear they want to see AP in a language, regardless of major.