It opened in 1931 and underwent a major renovation in 1997. Apparently, the water usage is sustainable (see below), but it still doesn't excuse the fact, in my mind, that continuing to support the upkeep of a green-ass golf course at the edge of Death Valley shows how out-of-whack its patrons are with the changing climate.
"In an area as hot and dry as Death Valley, balancing water usage with conservation requires significant planning. Furnace Creek and its namesake resort exist in their location because natural spring water flows from nearby mountain ranges to create an oasis. By routing the water from one point to others, the resort’s goal is to use the same molecules of water for several purposes. The spring-fed water is first used at the Inn to irrigate gardens and supply the swimming pool which was designed with a flow-through system that minimizes chemical use. That water then continues downhill to the Ranch where it fills the ponds on the golf course, providing habitat for local and migratory wildlife. The water in the ponds then irrigates the golf course." - How Xanterra’s Furnace Creek Resort is Sustainable, greenlodgingnews.com
Well they've also denied an oasis to the entire local ecosystem. They can claim that golf course ponds fulfill the same purpose all they want but nothing wants to live next to golf carts and flying golf balls if it's big enough to recognize it. People think deserts are wastelands but in reality that water is even more critical because animals can't just pop a mile down to the next spot. Then there's the effect on local plants, they're diverting all of this water and they probably killed the entire local plant system.
Sustainability also means taking care to build in places you won't impact as much. There's no world in which growing grass in a desert is sustainable. It doesn't matter how much technology you throw at it unless you figure out how to get everything you need from the air itself.