That seems off. The U-2 used the same engine as the Boeing 707 and then later the B52 back then. And I can't imagine that the engine are really all that powered up on landings since the U-2 acted a lot like a glider when landing.
Sure but B52s have 8 of those engines and they don't need baffles and/or aren't destroying them on a weekly basis. That story could be true but it seems unlikely that it would be U2 planes that are causing enough turbulence to destroy piled up mounds of dirt by the runways.