I don't believe he would be so naive to publish this without having checked that matter with transaction 828ef3b079f9c23829c56fe86e85b4a69d9e06e5b54ea597eef5fb3ffef509fe before.
What's worrying about the Double ROT-13 cipher is that its use can be completely undetectable. It's thought to be the most common encryption method used by terrorists.