Actually they did make a presidential edition. I saw one of these when I lived in MD. Looks Identical from the outside with the sail panel oprea lights. It also was black. I just remember seeing presidential edition on the dash plaque. It was at a used car dealership. I watched the price drop from $1500 to $500. Friday I stoped by to get it & they had sent it to auction.
I was never really sure if it was a Dealer installed marketing idea or if it was GM. That was a long time ago.
I just did a quick google search & there seems that there are presidentil editions made by Buick.
I do think he has a lot of misinformation & at $6k he will have the car for a while.