No, they aren't. Locally, the person with the most esoteric knowledge is probably a weird nerd. It's mostly an accident that they chose to invest time in things typically associated with smarts. But globally, the best wizards got there by making it their profession. So maybe at your middling university, the people who could land a job at a frontier lab were nerdy wannabe frats, but at decent universities like MIT or Tsinghua, they're usually just better in every aspect of their lives. E.g. MIT has "math olympiad fraternities" all the cool kids join.