The author is right leaning.
So she is doing a wider critique of the adults acting as children and the "woke" left and its intolerance I think. As the ur text for millennials she thinks that HP has a hand in shaping the forces which attacked Rowling. There is something in that, but there is much more.
Simplistic politics are at the heart of this, but that is true of both right and left. The wider shift in society which led to political polarisation is beyond JKRs influence.
HP are very traditional liberal books reflecting JKRs politics. Yet they are about good and evil - something pretty universal. That is why they succeed in every country in the world. Kids who read them can grow up in different ways.
Yes the fandom getting a powerline through Dobbys grave shifted is kind of ridiculous. However if there was a shrine to a football, or rock star on a beach the same thing might have happened. It is a testimony to the power of popular outrage not something unique to HP.
The books are pretty black and white sure, but all great children's literature has complexities in it. Harry is a flawed hero. One of the villains has a redemption arc. It portrays a hostile media aiding a coverup of the truth and using cruelty to do so. The government is corrupt but also a force for good.
The Metro journalists we are just talking about in their absolute certainty in using their power to condemn JKR remind you of anyone in the books?
I think it is an interesting article to be sure. The thing is JKR's stance has always been that anyone who really understands the books would not be surprised at her position. She is right of course.
Just think about it the whole thing reads like a HP novel. A group of crazy dark wizards doing weird magic experiments on unhappy kids with support from sections of the government, wealthy elites and a media coverup. The heroes a bunch of persecuted witches who against all the odds manage to get the truth out while juggling family responsibilities.
Though ironically the plotline is way closer to another children's book series whose author failed to step up when JKR did - Phillip Pullman's Dark Materials. Very keen to criticise the church, not so keen when it it is crazy medics and academics warping kids lives.