IME rust is typically much less of an issue in Colorado than the Midwest or NE, but mag chloride is still used here and can cause problems. More of a potential issue if the vehicle sees frequent mountain driving in the winter without periodically spraying off the undercarriage. That said, a 2017 that has spent its life in CO should be a pretty good bet from a rust standpoint.
Edit: just saw the pics, I'm not seeing anything concerning.
Roads are mag chlorided when it snows, but it's a dry climate, so that's not as often as the NE. I-70 is a different story, "ski vehicles" are at risk if they aren't washed when put away.
My 80 is a original Colorado truck and has some rust issues. My 60 was an original Colorado truck and pretty much rusted to pieces. If well cared for and given an undercarriage wash when driven in winter, they can stay pretty clean.
I have 5 Toyotas in the driveway and all of them have spent their entire life in northern Colorado, all of them have no rust what so ever. They use mag chloride here. Our 96 4Runner has probably seen the most neglect due to a teenager having been the primary driver for the past 6 years and it's still rust free. The 96 4Runner has lost the majority of it's clear coat, so I do think being closer to the sun may have some negative effects on the exterior and possibly on the interior, but as new as that 2017 is I would not worry about that. Brad