At that huge scale and tiny speed the structural material being compressed would prevent any useful power transfer. It seems like there are lots of ideas like this from engineers who partially understand other disciplines, a little nugget of a good idea but with knowledge gap issues that prevent feasibility. I still think they’re a good thing because eventually someone will float an idea with potential. There’s no harm in throwing ideas at the wall to see what sticks!

Wouldn't be fun without a challenge.