This is taken completely out of context. He was referring to a fake stock market for conference attendees at http://secondmarket.com where Stack Overflow "closed" at something ridiculous like $365/share
He is right to say so though. I don't know about SO being worth 8 or 9 figures, that's very comical. If you don't think so, then I have a one way first class ticket to reality that i'd like to sell you for $4,200.