Does getting an undergrad degree in astronomy and physics, and then a math PhD from UIUC, really count as "blooms late"? Sounds like a fairly standard career path to me.
You're correct: Wired has hyped the original title of the article in Quanta Magazine: "A Path Less Taken to the Peak of the Math World". Any time you see the words "Math Genius" you should assume hyperbole.
If you like this kind of story, I highly recommend putting Quanta (https://www.quantamagazine.org/) on your radar and avoiding most of the tabloid-science articles in Wired.
"and the truly great ones are dead before they're 40 so all old mathematicians must be worthless" I've heard that one, too. Doesn't make it beneficial to the field.
If you like this kind of story, I highly recommend putting Quanta (https://www.quantamagazine.org/) on your radar and avoiding most of the tabloid-science articles in Wired.