Why would you doubt it?

The brightest students of most nations are often sent abroad to enrich their countries with knowledge from the great universities. NK is almost unique in its inability to do this at non-Chinese great universities, so that is the only viable route.

I would doubt it because North Korea has extremely strict controls on who exits the country for any reason, but especially for education. I know this has happened before (for example Kim Jung Un studied in Switzerland under a false name when he was a kid), but it's extremely rare, and runs contrary to the North Korean philosphy of Juche, self-reliance.