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Perhaps space itself is the spacecraft, with extra-dimensional links between matter hiding in dark energy, creating an almost infinite capability for sensing and affecting matter? Perhaps black holes are the homes from which these aliens reflect their powers across the event horizon, providing powerful reach and safety? Or maybe they just live in the ocean and they don't like black holes either. I mean if we're going to go tin foil, might as well go all the way.

I believe in Star Trek cannon, Romulans use artificial black holes as the power source in their ships.

The „three body problem“ books develop an idea that is very similar to what you are suggesting.

Similarly is that all black holes are advanced civilizations that live within the black hole.