The math olympiad success underestimates him.
I would say that in terms of mathematical abilities, Gold on the IMO <---> tenure at a top-100 university.
He may be working in the wrong subfield of math to win a Fields medal.
I think the level of productivity he has shown in just his undergrad is crazy! I think you are right that if he holds this up it will be exciting to see what comes next.
Hopefully he doesn't read this and develop a complex :)