The 6KJ number is flat-out wrong. You cannot multiply pressure * volume like that. It's not an isobaric expansion. I mentioned this in a reply to his comment.
As for the 15JK number, I cannot see any estimates in this thread saying 15JK. Could you link the comment?
The 100atm figure is assuming that the linked article's calculation of final pressure is correct, assuming the thermos doesn't burst beforehand. Although I fully agree that a standard thermos is unlikely to achieve that number.
And as I said a lot of the energy won't be focused. This is just a first approximation, to indicate that yes, potentially the energy is there.
As for the 15JK number, I cannot see any estimates in this thread saying 15JK. Could you link the comment?
The 100atm figure is assuming that the linked article's calculation of final pressure is correct, assuming the thermos doesn't burst beforehand. Although I fully agree that a standard thermos is unlikely to achieve that number.
And as I said a lot of the energy won't be focused. This is just a first approximation, to indicate that yes, potentially the energy is there.