It doesn't actually say it's going to be a miniseries.
In fact, the last line of the article indicates he WON'T be doing a miniseries.
"I think there permutations in which you can tell the myth in a different way."
What he's saying is that IF he was going to do THE BOOK exactly, it would need a 4-hour miniseries, but that he's NOT doing the book EXACTLY.
In fact, the article discusses the drawings he is doing that will be the basis for the FILM.
Reading comprehension, people!