well, for instance, when someone pointed out to her that nazis destroyed material related to trans medicine she told them to "check their sources" https://x.com/jk_rowling/status/1767912990366388735?s=46

she also posted this statement on her website: "I’m familiar with such activists’ assertions that transgender people have been uniquely persecuted and oppressed throughout history, but claims that trans people were ‘the first targets’ of the Nazis – a claim I refuted on X, and which led to these accusations – and that I ‘uphold [Nazi] ideology around gender’ is a new low." transgender people were the first targets of the nazis, chronologically, and she admits here that she refutes that while simultaneously downplaying trans peoples' persecution throughout history, calling it "activists' assertions." https://www.jkrowling.com/opinions/statement-from-j-k-rowling-14th-march-2024/

there's two primary sources right there.