I think AP classes allow you to go over a 4.0.
Extra curricular activity has always played a role in University admissions. It's nothing new for today. My friend's daughter has done it all; played sports, student gov't, volunteer work, internships you name it.
But even with AP classes something has changed. I was hoping someone like Flash who works in academia might shed some insight but you hear a lot about grade inflation and it's a real thing.
I became a father late but numerous friends of mine have kids applying for college now and from talking with them the story I shared in the OP is far from an anomaly.
Parents talking about their kids often over interpret their kid’s achievements
SAT overhauls itself ever eight years, and usually increases the value of scores, and AP classes are overvalued
And to show you how peculiar admissions can be, my son, who was accepted at several Ivy League schools, and attended G’town, was waitlisted at BC, and from what we could gather as to why we were led to believe it was because the last thing BC wanted was another Irish kid from the NE