No, so if buffysummers is permanent. And it's renamed to rickjames. rickjames will now be permanent.
However if you had doctorevil and renamed it to buffysummers. Buffysummers would no longer be permanent, however that permanent status would go to the temp username that is created in place of buffysummers.
The way to think about it is, if you go to your profile page, there is a number next to your username. That's user internal userid. The permanent account is attached to that userid not the username. So wherever that userid ends up, is where the permanent status goes.
However if you had doctorevil and renamed it to buffysummers. Buffysummers would no longer be permanent, however that permanent status would go to the temp username that is created in place of buffysummers.
The way to think about it is, if you go to your profile page, there is a number next to your username. That's user internal userid. The permanent account is attached to that userid not the username. So wherever that userid ends up, is where the permanent status goes.