I'm not sure about auctions, I can see that MY19 GT used or dealer demo are for sale between $55k and $65k. I checked 2018/2019 cars and from dealers only, not private sellers.
anyway, still trying to figure out the price for the one (which is not supercharged) for sale in that ad.... at the end the GT-H package with some performance add-ons plus all golden things is basically $43k, so at least $11k are added to the price without any reason