I'll take a pass on it.
Hint: no working prototype, either.
Cheers!
Am certainly no expert.
However, am convinced that at least 1 and probably all the 3-4 different methods of extracting energy from the quantum substrate do work . . . and cheaply.
None of them violate any basic laws of physics.
I certainly don’t think we know near as much as we think we do about basic physics, BTW.
There are likely powerful reasons such has been kept hidden.