SS is one of my faves, so i am stoked that he took his camera, conscious, and cereal to the great north to help preserve these natural wonders.
i saw his pics, clearly they are "fortified" with post-processing, especially the contrast. in any case, they are beauties, and ansel adams himself would be proud.
this technique of creating plastic negs from a digital file has been around for some years, but I think the printing industry has made it more economically feasible to do this. yes, its a helluva lotta work, but if you are paying an assistant 10 bucks an hour for the honor of working with you (and by "you" i mean SS), then it is more doable.
This application of creating plastic negs is also leaching out into other areas. e.g. you can take a digital file, create a tangible negative, and make a tyntype, a kallitype, etc in the darkroom. The old meets the new. Like a 50mm Summitar on an M8. Cool.