Logically speaking, when they unofficially model car X to look like car Y (as noted by not sharing almost any of the livery, having a completely different name and manufacturer and the details of the actual body not being entirely the same), it is indeed unreasonable to expect that it will have all of the same details of the real life cars. This really is not news, since the sneaky way of not really including iconic race cars but very close facsimiles of them has happened in literally every game in the series that has had fictional race cars in it
It's not anyone else's fault but your own that you believed a car described in game as being fictional was such a perfect recreation of a real life car that it was beholden to modeling innocuous and arbitrary details of said car.