yes he copied the pacs data (THE IMPORTANT DATA) from one to another. this isn’t something you can do because you cannot read nor write SE with a proxmark.
what is it you’re trying to achieve because if you’re trying to make SE cards youll need the omnikey not just the proxmark.
you can attempt downgrades to the legacy form of the credential that uses a known key via proxmark but if the system is checking for the SE auth and SIO you’d be shit out of luck.