It seems like they are considering that possibility. They just think it’s unlikely.
But everyone has told me this is permanent?
If what that poster said is true and the researchers are correct, that wouldn’t preclude PFS from being irreversible without proper medical intervention. He just said that there apparently isn’t any permanent damage to the nervous tissue.
However, I believe you and others like cdnuts, so it seems like it is not irreversible (naturally) in all cases.