Hopefully some other way than just by taking it out of diamond anvil. If not than this is much less interesting although at least of some interest.
> and would that be more energy than it takes to run a diamond anvil cell?
Do you want to get more energy than you put in? Did you thought this through?
> Second, isn't this similar to making a gun that shoots bullets faster than ever before, and calling that "second only to light-speed?"
I think if this material can hold more chemical energy per unit mass than any known conventional explosive material then it's something worth noticing.
Are you asking if they've violated conservation of energy?
EDIT: done being a troll :)