I don't like the sounds of that statement. I think TM'ers would be some of the few in America who are not completely surprised if a nuclear blast/s was to destroy a city. I really cannot think of anything else that would accomplish what they have been bragging about for all this time.
The post is a reiteration of the "Cave of Darkness" threat from the Abu Hafs al-Masri Brigades (I think)at the beginning of the year, but with some additional extreme language. Instead of "the fuse is lit" it says "the wick has burned".
Cannot tell from the machine translation but it looks like the same eight demands they issued back in December/January.
They are using the same language UBL used in the November 2001 tape where he boasts of having calculated the casualties beforehand in calibrating the attack.