When we talk about the universe expanding, we mean the ratio (galaxy distance/galaxy size) is increasing. We use the scale factor a(t) to represent this. Whether (galaxy distance is increasing) or (galaxy size is decreasing) is equivalent. All we know is the ratio.
Of course there is conflict between the Block Universe and Bell Tests.
The Block Universe is a classical concept for a classical Universe.
The real Universe is not classical, so classical physics fundamentally doesn't apply to the actual real Universe.
(but classical physics is still very...
Physics doesn't breaks down at or beyond the event horizon.
And time doesn't stop for an observer at or beyond the event horizon.
And we can survive at or beyond the event horizon, if the event horizon is large enough and not too much matter is falling through. According to General Relativity...
You have to reverse the question: how would you know it exist? You only know if you observe it.
Just like in a Pokemon game I used to play. I walk the path and when I'm in view of the hospital, nurse Joy is at the window waving at me. Was nurse Joy already at the window before the hospital came...