"Hoax" is too strong a word, but I think "typical exotic car dealer marketing bullshit" would be accurate.Well, all I can say is I ran a full-color one-page ad in the Dupont Registry one time, and it cost me nearly $20k.
AND, Knight International has a very impressive web page. Would seem to be a very expensive hoax, if it is one.
Dealers in the rare stuff do this kind of thing all the time. The absolutely key thing for them is to get a lead. If they can't get a lead from a seller, the next best thing is to get a lead from a buyer; they then take that lead and go fishing with owners (or actually more often with other dealers and brokers, who might happen to know of a car for sale somewhere) - "I have someone who's interested in your car, might you consider selling it?" That's the game they try to play.
The fact that they have not got for sale the exact car they are advertising is almost irrelevant. They'll just say, "Bad luck. I have a sale agreed on the car that was advertised, but I have another thought because I know a dozen or so F1 owners. What sort of price did you have in mind...?" And so it goes.
Ironically, the above mentioned London dealer David Clark pulled exactly this stunt on me when I responded to an ad he had placed in one of the British magazines. "I don't think that particular car is still for sale, but...blah, blah, blah."