Rebanding only moved the channels down 15MHz. Nothing else.
When systems were rebanded, SOME system administrators took that opportunity to switch from analog systems to digital systems. That was unrelated to the rebanding process, just something done when systems were replaced.
If it was analog before, it's entirely possible they went to a digital system. If it was digital before, it's entirely possible they went to encryption.
Looking at their license, it shows they are still running analog, but that just means they may not have updated their license to show a different type of emission.