Yeah, that's a very stupid change/comment even when the final outcome is the same as the books. The Dragon being a male and therefore already tainted is a driving point of the story, as you mentioned.
They probably put that line in to try and soften the blow because the Male Rights Activists who know nothing of the books this series is based on are about to go full blown "REEEeeeeee!!!!" when they hear about a show where women are in control and men who show magic potential (ie Chads) are effectively neutered by the matriarchy.
Personally, I wouldn't have done it if it were my show. I would have kept it like the books.