"Publishing a globally famous author with a controversial record is not a moral decision around freedom of speech (particularly for a billionaire well versed in self-publishing their own content), it is a commercial one driven by cold and hard P&Ls."
The problem from the off is the framing of what Jo Rowling wrote as controversial. It is not.
Jo Rowling's position on biology is mainstream scientifically supported fact.
It is those disputing her whose claims to authority are controversial.