I don't think they ever actually nerfed it. Players just out geared it which made it easier. Even through the DF players will still see most of the mechanics. A couple are usually skipped though. The ones that don't are just more forgiving than they were. I recently did a minimum item level sync of the fight. Admittedly, it was a little frustrating at points, but it was fun. Probably won't do it again for awhile though. :p But it was neat seeing about half a group of new players trying to figure it out. It definitely felt like it did on release. I've seen a lot of groups in the PF lately recruiting for the hardest difficulty level possible for things like this or Extremes. I got to experience a lot of these challenges years ago, so i think it is great that new players are taking the time to truly experience a lot of pieces of content the way it was intended.
