It depends on whether the movie says it or it's a thing from an interview, in my book.
As in, if the movie is making a case that something went down a certain way in real life when it didin't (say, JFK) then... yeah, well, that's a bit of an issue, sure.
If the movie is out there being a movie and the director is just saying he liked it more this way and you weren't there to check and get off my hair and watch the movie... well that's not an unreasonable response to people well acksually-ing a movie.
And again, haven't seen the movie. No idea what this is like. All I'm saying is this attitude is not new for the guy and his historical dramas are all heavily stylized and put drama ahead of accuracy for narrative purposes and that's... fine. At worst it's an excuse for people to make nerdy videos about the actual history, which I'm also fine with.