I didn't say 2000 was the first year, it was just the first cover shot with a skier sliding a rail.   My hill's park first got a rail in 1998, which is also the year I first hit said rail, and it was nothing new at the time.
Hell, I remember back in the early 90's I would try and jib this bench that my step brother had set up in the backyard for his snowboard...   shit was wack, but it was still "jibbing" in suppose.