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Way i see it, is that it implies you can manipulate gravity, if you can move stars. Or at least, herd black holes to use as gravity tractors.
Would also be interesting to see if they are using optics for communication. If no visible optics, i would guess that they have solved the entanglement issues, and using that for comm.
Would also imply that it IS a machine intelligence or culture, as the radiation hazards in there would preclude most ongoing biolife, other than possibly zoos. That would definitely inform the SETI and METI discussions, and may answer some questions about the Fermi Paradox. Once you have a safe haven built inside your galaxy, why would you venture out of it any further.? It would also seem to imply that They have reasoned that any other life is a threat. Not a friendly outcome, that, and posits against AI creation.