Amurika isnt going to claim it has killed the guy if we were not 100% sure he was dead. Its would be far too easy for him to just put out a video that has some kind of dated material(newspaper, tv show etc) with him saying "nice try america".
We may not have actually killed him like we said we did, and he may still be alive...but you can be damn sure that he isnt free, and if he is alive he is in a world of hurt in some bumfuck military prison getting tortured.
People need to use their brains on this one.