The article is arguing that we should be doing more to help her understand.
This has been done. All kinds of people have made thoughtful criticisms of her essay (much more level-handed than mine).
Her response has been to double down: https://mobile.twitter.com/jk_rowling/status/127975541862187...
One must be willing to learn in order to be taught. She is not a person that can be reasoned with. She believes this thing she believes and feels the need to broadcast it widely, and she has made up her mind.
This is the hill she wants to die on. If she’s factually on to something, it doesn’t matter. It doesn’t make this less of a stupid thing for her to do.