Nobody is claiming that an undersea nuke was intended to create an EMP. The claim is that the military guy refused to do a proper launch of an EMP nuke (which would be called an Iranian attack, presumably, as set up by Lindsey Graham) and instead detonated it in the ocean where it would not do the damage.
I would say we should all keep our ears to the ground, especially TX FReepers. When we hear rumblings of the Bush family fleeing to Uruguay the nuclear clock may be seconds to midnight. Or will they be making an underground stop at Denver first before their connecting flight? :-/