What you are seeing in this video is a small stirling engine that is running off of the heat being generated within Brillouin Energy’s Hydrogen Hot Tube (HHT).
What we are seeing here does not prove a damn thing about anything. Okay, maybe there is more information in a longer video presentation, or a paper, but this alone tells us nothing.
You could make a brief demo more convincing than this. In this video, there is no way to know whether the input power to the Brillouin gadget produces enough resistance heating to drive the Stirling engine. The gadget could be acting as nothing more than a complicated electric heater. To demonstrate that is not the case, at very least, you would have show the Stirling engine not moving (or barely moving) on top of a resistance heater, and then show it moving with the same input power going into the gadget. That would not be very convincing. There are ways it could be a mistake. But it would be a start.
I do not understand why people do unconvincing demonstrations. It is worse than no demonstration. Arata did something similar to this, with a small thermoelectric gadget driving a small motor. It proved nothing, for the same reason this proves nothing.