"The destroyed unit is removed immediately. Unless otherwise specified, no save or other special rule can rescue the unit at this state; for them the battle is over.”
This does not say removed as a casualty, it is removed from the game. If you read the whole passage, to help clarify what they meant by removed, the models may not actually be dead, they could have just run away or be ripped to shreads. It doesn't really matter what happened to the unit but they are removed, and not removed as a casualty.
I would also say Death or Glory would remove the model too and you would not get to roll for ever-living. It does not say removed as Casualty.