Unless they use dilute H2O2.
***H2O2... sounds chemical. From the article:
Computed volumetric and gravimetric energy densities were found to be far above those of any known chemical source. Even by the most conservative assumptions as to the errors in the measurements, the result is still one order of magnitude greater than conventional energy sources.
Hopefully it's true this time, unlike the last time I ridiculed, and disproved, that claim.