Because they don't have to talk about it. When have they ever openly discussed the departure/hiring of certain cast members? The only time I can think of was when they got Mando and that's because it was a completely open casting call, unlike previous and subsequent ones (I assume).
They only said anything about it to quell the negative press they were getting, which sounds cynical, but that's showbiz. Unless the news bubbles up again, I don't see them addressing this in the near future.