Is it just me or does anyone else wonder if the job and the job title are disappearing? In TV animation the director (often called a producer) is simply a sort of art director. The closest thing to a director in the traditional sense of the word is the writer.
The writer determines what the tone of the series will be, what stories will be made, all the details of the story, what characters will be used, and sometimes even what voice talent will be used. The writer is not answerable to the director, the director is expected to take the script that's handed to him and do the best he can with it. If he doesn't like it, well... there's the street.
A popular book for animation writers outlines the process:
Notice what's missing here? The script goes directly to the storyboarder. No nosey, interfering director to get in the way. What on Earth could a director contribute anyway? The advice to writers, "...nothing is left to the imagination of others", says it all. The director is one of those pesky "others."
I don't mean to say that the author wants to dispense with directors. My guess is that the director was omitted simply because the modern director's role is too unimportant to list in a short summary (obviously this doesn't hold for artist/creator-driven shows at places like Cartoon Network).