This is, of course, ridiculous. Still, there's logic to it: find some mass-market component that is used in a luxury service, and provide a high-end alternative. The kind of idio^H^H^H^Hcustomers who want luxury certainly don't want it contaminiated by something from Walmart, regardless of the actual quality. It's the same reason as for those gold-plated cables for audiophiles.
But the high end drink chiller exists, and it is called "whisky stones" or similar.
The cooling power of ice comes from the phase change from solid to liquid, which absorbs a ton of heat. The temperature change from 25 to 32 degrees Fahrenheit is minor in comparison.
Whiskey stones do not change phase, and so they have a much smaller amount of heat they can absorb, and I haven't found them to be very effective for chilling a drink to 32 degrees and keeping it there. There's no dilution, but that doesn't matter to me as much as the temperature.