It was "trans women are going to rape children _or something like that_".
Most reactions that I saw about J.K. Rowling's 3600-word essay point out that she equates transness with intent to rape, so I think that the original sentence with the "or something like that" is ok.
Here are two links:
https://wessexsolidarity.wordpress.com/2020/06/14/j-k-rowlin...
https://www.lgbtqnation.com/2021/12/j-k-rowling-tweet-paints...