Show me a scripture passage in context that describes this prophecy. There isn't one, this idea is developed out of other flawed theology.
Perhaps there's another explanation?
Perhaps He meant it is legally finished, settled, done?
If it was "finished" as you seem to construe it, why did He go away to prepare a PLACE for us? Supposedly His carpentry would also have been THEN finished!
Ahhhh, but I see--you want to pick and choose what's finished ACCORDING TO YOUR LOGIC! Ah so! Cute.
I think my CPU works differently.