As others have pointed out here I don't see how empowering some specific group to decide is any different from a traditional publisher model, or indeed how picking a group steeped in a specific culture bubble will 'fix media'. (Though hey, I invite them to prove me wrong... Any fix would be a welcome fix these days)
Actually thought this was kind of funny at the time because a few reaction pieces were like, "they are being mysterious about their new business model."
This was clearly going to memberships. If you aren't trying to mine traffic for ad dollars, that leaves one other monetization avenue (other than like, an NPR "donate and get a tote bag" strategy).
Don't think that's a bad idea intrinsically, but not sure what content Medium provides me that I can't get elsewhere right now. Most of what I can remember reading on their platform is basically LinkedIn Influencer stuff but on a nicer interface.