That doesn't necessarily mean it's been done as exactingly as PD have demonstrated they like to map tracks, judging by their efforts at Laguna and the Nordschleife. It's not necessarily in a compatible modelling system either. Even if it is anyone who's done that sort of modelling knows there are often problems when you try to import geometry designed in one editor into another editor, it generally winds up being less painful to just start from scratch.
Sony already had Monaco mapped yet I'd bet PD went and did it themselves.