The fact that Rowling has descended into Trumpy birther-style conspiracy theories about a cisgender athlete whose looks, ability, and makeover choices she disapproves of should serve as a warning: this is the logical endpoint of the gender critical "movement."
It was always this, there's just no longer a pretense of good faith or high-minded feminism. Just rich, bitter old people tearing down strong women who don't look or act feminine enough or in "the right way."