Seen this discussed in the Noah Hawley TV series thread on here.
The thing is with Ridley is that he says a lot of things - and a lot of those things contradict other things he has said or what came before. I always find him very off the cuff in his thoughts on the films (his comment about the Alien regrowing itself after being mangled in Covenant comes to mind). That said one thing is that Ridley will do what Ridley wants, even if that flies in the face of canon (even the canon he created).