If we imagine a third observer in a space craft traveling close to he speed of light, it's possible to construct the scenario in such a way that the pilot of the space craft would observe the two events happening at the same moment. Time is relative

Ah yes that’s indeed true.

But from the Earth’s reference frame wasn’t the Pluto activity I mentioned earlier simultaneous with what happened 5 hours ago on Earth?

So couldn’t you say from Earth’s reference frame this black hole’s activity happened simultaneously with events 20 million years ago?