I’m waiting for more to be published on the topic before I consider it more closely. Something with so much potential for profit should have an army of physicists jostling for grants to study it. It doesn’t.
It is the profit potential which drives the secrecy. Also, the global oil industry does not want their control over this planet to be threatened by an energy source which does not depend upon oil or coal. There is advanced technology which is being controlled by the military industrial complex, which has gone well beyond freedom of scientific discovery, so the potentials are not in the public venue for 'physicists to seek grants'.