Sounds like (despite the denial) they're trying to fight back, with the recent increased efforts and considerations to get rid of the dam. Telling us how "nice" it is. Which it is, of course, but for it to be so nice now, after being turned into a water storage tank, it must have been just amazing when it was intact.
It does say they show historical information...but looking at the list, it doesn't look like it shows any extensive photos etc. of what the valley was like before it was flooded. Somehow, I doubt they will be adding that one...8^)
Gary
Yosemite Photo Galleries: http://www.pbase.com/roberthouse/yo