Like a good startup YC wanted to validate their assumptions and experimented with "no-idea" teams. Considering they don't have that option anymore, I'd venture to guess that they disproved PG's original saying and are now realizing that a good idea correlates with success. That's my guess.
Having no idea is crazy though, you want someone with at least some idea of what they want to work on. Also I don't think they accepted enough no idea teams to have a good statistical reference.
