Can the developer of a program who distributed it under the GPL later license it to another party for exclusive use? (#CanDeveloperThirdParty)
No, because the public already has the right to use the program under the GPL, and this right cannot be withdrawn.
And thus the program stays gpl, and you can not put it in another package under another license.
So for your own good, you better quit spreading nonsense, which makes you look like someone who can not understand a simple legal text.
Kind regards, Vincent