[coryfklein]

In the exact quote you gave, he says that SO is different from "wikis" in that the question is written before the answer.

When most people think "wiki", seeing answers before questions is certainly a common characteristic they could assign to the concept, but it's not what makes it a "wiki".

I could design a wiki that was text-only and say, "unlike wikis, we don't present photos", but that wouldn't make it not-a-wiki.