In light of the discussion he seems to be hedging bets in this area. I'm not sure if that the right strategy from the ex-risk perspective. At the very least it seems inconsistent.
I think it could be consistent if you treat his efforts as designed to gather information.
http://blakemasters.tumblr.com/post/24464587112/peter-thiels-cs183-startup-class-17-deep-thought
Some perspectives on AI risk that might be interesting. Peter is (the primary?) donor for SI, and an investor in AGI startup Vicarious Systems.