Actually, he probably would have ignored it, or at least held out longer, until maybe too late to do anything about it. He's a kid, and kids don't necessarily think, "chest hurts after getting pounded at football practice? Gee, I must be having a heart attack!"
Hell, there are adults who ignore serious symptoms, every day, all over the world.
I'm going to get off the cynical train that seems to be driving MacRumors lately, and state that I'm happy for him - happy that he got medical help, happy that Tim Cook reached out to him, and happy that instead of a funeral, his family has something cool to look forward to.