I had heard once that dealer vehicles like this were considered "new" up to 15k miles. (at least that what I was told by the bank) Mabye since LCs have such good longevity this is the case or the times have changed and dealers have somehow figured out how to game the system. Or, maybe since people can now get a 10 year loan this is just what it is...
New is New and 20k miles is "used" in my book. Either way NADA/Kelley still has (used) book value around 71k / 72k so they are asking full dealership retail on it. Just a quick search at some online dealerships shows new almost no miles, in the ball park. So you can find, if you look, 2017s for the same price with fewer miles. All depends on the buyer in this case.