I've done Cathedral Rock off track, I never new there was a track. Did the sign look newish at all? I do know the land slide off of Cathedral Rock has made it easier to access the cliff base of Cathedral Rock but unless your a climber you won't be accessing the peak from here.
The sign is at the edge of the landslide. It's new and hand written (on one of those foam pads you kneel on when you're gardening believe it or not), but is nailed in front of a wooden board which is presumably an original sign.