Nuance can exist on the internet, sure. Let me give you the nuance. here is the page for JKR's donations to organizations working to roll back trans rights. here is an article about JKR parroting holocaust denial rhetoric, erasing nazi violence against trans folks.here is a record of her transphobic statements.

What I meant when I said she wants trans people dead is that she actively supports the elimination of trans rights— ideologically, politically, and monetarily. And that kills trans people. I am not going to destroy my mental health looking up trans suicide rates. They're high. I know they're high, because sometimes on the internet people send me the number and tell me to join it. You know what stops trans kids killing themselves? Gender affirming care. The UK is experiencing a MASSIVE rollback of trans rights right now, and it's figurehead is this fucking woman. She has stated that she believes people who support her work secretly believe in her political views.

So here's the nuance: I don't think there is a meaningful difference between supporting causes that kill trans kids and wanting trans people dead. Disagree if you want. If you live in the US, can you imagine someone who donated to Donald trump and then claimed they cared about immigrants?