A small number times another really small number.
I’m thinking, that is a polite way of saying that any real-world advantage, would be eaten by friction loss?
In this case, there would be zero friction loss, or near zero friction loss because this contraption is in a vacuum.
The folks doing this experiment claim vacuums aren’t really empty, and there ARE some particles in vacuums. If that’s true, the number can’t be zero friction.
However, consider that 68 billion revolutions is 6.8 x 10^10, and that happens per second. Multiply that by 2 x pi, and that’s the distance the end of the little spinner goes in one revolution. So the v is 10^11 nm/s, roughly. That’s a big number, but what is the mass of the little crystal thingy you multiply that v number with? 10^-9 grams? Who knows, maybe less? The momentum would be in the hundreds of nm g/s. Not a huge number.