If 1/2 are planning to go back at a later date, that means they've decided attending college is in their best interest. Which was my claim; I didn't say they are currently attending.
I guess it ultimately boils down to whether you trust the author's reporting; I typically assume everyone takes the article's contents as granted unless they've explicitly stated otherwise.
But in any case, "keep your options open" is not exactly the message touted by the Thiel et al PR campaign surrounding the fellowship program.