Of course it is not all historically correct! Nothing in any mod or in stock is entirely historically correct, and what exactly is "historically correct" anyway? Even historically correct is not historically correct. Because history is made in real time, with no blueprint and of a million people's concurrently interacting free will. History can never be recreated. Even with a time machine rolling back time so real events restarted from a given known point, the future of the past would roll out differently.
So no. Nothing is "historically correct." We can't agree on what that means or even if it has any meaning whatever. If you want to be literal and say, is everything as it was on the date I select, I say no, because you weren't there. It was all perfectly correct until you ruined it!