She was clearly expressing a sentiment that she felt to be true at the time, even though it isn't backed up by the data -- much like this similar scenario.
Is that clear? She's a professional actress; if she were reading a line written by some PR hack that she didn't really believe was true, how can you be sure you could tell?
Maybe she believed it, or maybe she was told to say this sort of thing to promote the movie. Since she's a professional actress, I'm inclined to believe it's the latter. She probably wasn't totally ignorant of her own industry.