Not necessarily. The director is telling actors, lighting engineers and cinematographers (among others) what they would like to see. Those others actually create the art."I know it when I see it." may apply here.
That said, a director is doing a lot more than entering a prompt, at least for now!
I'm not being flippant here. I am asking a real question: is the director an artist, if what they do is prompt others to create what is in their mind? And if so, what quality about the "other" being an AI (or multiple AI) causes the transition to "not artist."