IF something like this does work, I believe that it’s just tapping into an energy source we currently don’t know about and/or don’t believe there’s anything to tap into.
I don’t believe human beings can violate the laws of conservation of energy, it has to have a source most of us have no clue about.
It would be like Tesla’s car that tapped into energy in the ‘ether’ - there was energy to be tapped, people just didn’t know about it.
Yes - if they have anything I would guess they stumbled across a source that we don’t understand. They say they came across the “magnetic anomoly” accidentally and don’t claim to understand the source of the energy.