That's not stated in the description. They just can't have a past prior to the point of the erasure and are not present in the future. And she doesn't have a past prior to becoming a Self-Annihilator which is when her past was erased and she is not seen in Elio's scripts. Again, like the mod said, it doesn't prevent them from creating new history after their own was erased. It's also one thing for your origin to be erased and another for just a gap to exist between the origin and the present.
Whatever man
Obviously??? The state of her existence AFTER her past was erased???? Again, you had a mod straight up tell you you are allowed to CREATE new history after your past one is gone.
No