They are saying he backtracked. Nonsense. You can repeat a sarcastic comment multiple times.
Do you believe he was being sarcastic? If so, why do you believe it?
Admittedly, the confused Neocons in the Bush Administration started the "bull in a china shop approach" to the afflicted area, in the Near East by proclaiming a cultural attack. I am not suggesting Obama is the only miscreant involved.
For a different view of how to fight terrorism (mine), immediately after 9/11, see The War On Terror.