Ah, I knew there must be a catch!
None of this will be particularly useful unless it can be harnessed in the controlled environment of a ship.
If anti-gravity effects can be produced by masses moving at close to the speed of light, what abour masses circulating in a large toroidal field, with acceleration driving them past the point where they would generate anti-gravity effects, and then allowing their circliing around again to be boosted again?
Something like a bootsrap drive, even if it is only for the utility of reducing acceleration stresses.
Clearly we will need to learn a great deal more about the behavior of large amounts of plasma brought near to the speed of light, as we would most likely be doing if we learn to control fusion using a Tokamak-like design.
It does have a faint whiff of serendipity, but I love it when a plan comes together.
That's why I'm investing in Fusion.