They can advertise any msrp they want if they just never build any. I thought there was a guy here but maybe it was a different forum, I read a few, that had put a deposit and waited months and months and they kept offering him higher trims and so on. I do think he eventually got it. But it was like a year later.I think I remember the very base was that price because I looked it up at the time. They are not going to lie about that, but it is in the technicalities. No options and maybe not including shipping. Dealers marked everything up, but Ford doesn’t get that markup. I’m probably done for life looking at cars but the markups were crazy at some dealers. The buyers lost a lot of money on add ons they won’t get back ever.
They can advertise anything they want - if they don't build any or only a few they did nothing illegal. Honda outright admitted in a earnings conference call during the same period they were only building higher end trims - bragging about it to their investors.
In most cases most people do not want the base trim, so its just sort of a impression / loss leader type of marketing tool.