Let me see if I got this straight.
There is a lot of stuff out there and it is far away. But then there is a lot of nothing out there that we think should be out there but we can’t see it. We give it a name. We measure the movement of the space we can see based on light and surmise that the stuff that we can’t see (but are sure it must be there) must affect what we are seeing or the measurement of movement we have concluded.
Since this theory doesn’t fit anything that we understand, we must be in a bubble of space that has less stuff in it than anywhere else and what we are seeing outside of the bubble is a condition of the bubble.
Now I get it.
You’ve got the right stuff.