Sorry, it's not fake.
I still doubt it. I think it was leading up to this, perhaps as a deadline with Tehran, and he had to show something.
This is a fake, until there are some nuclear signatures. A nuke underground has to show something, unless they buried the bomb deep underground with no interest in research or supervision, just to blow it up. The bomb blew up near the surface - at least that latest seismogram says less than a kilo under, so their should be some venting or SOMETHING.