This site confirms: Kia K900 US car sales figures
We're definitely driving unicorns, that's for sure.
I don't get the "dumbed it down vs. the G90" comment though. The G90 starts at 6K over the highest possible MSRP of the K900 (2019)....which wasn't going for MSRP anyway. I got mine out of the dealership's showroom floor with < 20 miles on it at 11.2K below MSRP (with VIP package). I would've had a hard time getting a fully loaded Telluride for that price, since those were selling at a premium. I did speak briefly to a Genesis dealer when considering my K900 and it was clear they weren't wiggling on price much at all. 70K was within my affordability ballpark but not within my willingness to buy; that's just dumb money for any car.
G90 looks to have better wood, and I tend to prefer an integrated screen to the one that looks like it was dropped onto the top of the dash. It certainly has the V8 engine. But otherwise, I don't find it's style appealing, at all. The extra marker lights look weird with the 'extension' of the front headlights to the other side of the front wheels (and I'm a guy who loves LED bling everywhere), the wheel hubs are hideous, and that ginormous grill is just a caricature of what a luxury vehicle should look like, IMO. They're copying Lexus' worst design cues with that one.
I do wish the K900 had a larger pano sunroof. Other than that and a little better integration of the center console screen (like what Hyundai did for their Palisade vs. the Telluride as an example), and the appalling fake wood texture, I really don't have any complaints about the K900 design at all. Luxury sedan buyers in general are a dying breed, and a top-of-the-line halo vehicle from what is seen as a quality but 'economical/practical, if fun' carmaker was always a long odds option.
Noticed almost zero differences shown on Kia's sites for the 2020 K900 though, so they definitely aren't putting much if any effort into it (again). I'm actually a bit more surprised the Stinger sales were that low, too. The Telluride and Palisade are kicking tail however...I see far more of both of them on the road these days, after only what, 3-5 months on the market??