It won't be deleted this time. I am hoping that members whose dates are not as they should be will get back to me as you have so I can finish correcting the membership list before I hand the role over to the new chair.
The system does not keep them. It has only been recently that they gave us the option of "suspending" a member, which saves their basic information. Our only option in the past was to delete members, in which case everything including their profile was deleted.