Everything from Pre-Crisis has existed. The only real thing left of the Pre-Crisis universe were its survivors and that it's ghosts as shown in this story exist in some kind of afterlife apparently interplaying with the current continuity deceased as well.
Earth-2.1 as i will call it has it's own thing going on. This was the Pre-Crisis E-2 Batman but the new Earth 2.1 has it's own dead Batman as well.