Indeed - not that the ride isn't good, but for an almost entirely outdoor coaster with an unthemed track featuring, what, 6-7 animatronics? The ride vehicle is unique, the indoor show scene is nice, and they certainly did a lot of planting, but I can't see how that accounts for 3 times more than Everest, which built a literal 20 story mountain around its coaster of comparable length and intensity. Not to do any pitting of Dis against Uni. The numbers just don't quite add up against what's there in this ride, fun though it looks. It's the least themed of the major HP attractions, how could it cost the most?
It must include the landscaping, but I'd be surprised if it includes demo of Dueling Dragons. Imagine if Disney folded the 20,000 Leagues reclamation into the cost of New Fantasyland.
And even if it does include that, it's not like Dueling Dragons was an especially complex attraction to remove. It cost money, sure, but it shouldn't be a grossly significant amount.