Now, i reckon that if he wasn't really dead and they'd just made the whole thing up he would be in a pretty good position to expose them as liars, right, by, y'know, appearing on the internet holding a copy of todays' Jihadist Times.
Perhaps he died in the desert years ago and they've only just confirmed it so the whole shoot-out thing is a fiction, but surely a less verifiable and more convenient fiction would be if they'd claimed they got him in a mountain cave miles from anywhere.
But given that he's a CIA operative and is in reality enjoying a peaceful retirement in Guam at the taxpayers' expense I guess they're all free to say what they like.
We are however now going to have seven millenia of people shouting show me the body! followed by, that's not him for X reason, followed by: tell me the truth, all I want is the truth!