Does Craig actually deny "elementary facts about evolution" or disagree with mainstream cosmologists about the "age of the universe"?
Good catch, thanks - Craig is not in fact a creationist.
Going back to the original question, though, I think such viewpoint-cracking is what Carroll is going for. I wouldn't like to guess his chances of success - Craig is really good in public debating - but I do think that's his intended effect, and that he thinks it's worth it.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.