The Tulip has been the hero car for three years and that is unusual for them
Trailer 1, Trailer 2, key art, store pages. Same car.
GTA V's marketing rotated through a dozen vehicles. RDR2 barely had a hero vehicle at all. Here they have picked one four door muscle car and put it in everything for three years.
Either it is genuinely the story car in a way that matters, or somebody in that art department really loves a 72 Chevelle. Both are fine outcomes.