I recently read the Epic Tournament Rules and got it into my head that the old damage deck had been officially de-legitimized. But looking around at more recent documents, I get the impression that this is not so. From my (brief&lazy) research, it appears FFG was planning on deprecating the old deck, but then reversed course for reasons people debated about in several threads but offered not proof, and from there it was just arguing back and forth.
I'm actually not so much concerned with the sophistic arguments about why (looks like a hairy subject)... I just want to confirm that the old damage deck will remain valid in the foreseeable future, in both in casual play and tournaments. If so, it looks like FFG just didn't update one of their docs.