"JK Rowling is not a transphobe"

I see, she's not transphobic.

She's not transphobic at all. Instead, she's just

...Afraid of trans women because she thinks they might be rapists-https://www.yahoo.com/lifestyle/jk-rowling-accused-of-perpetuating-a-false-narrative-that-trans-women-are-predators-in-latest-tweet-200447279.html

...Afraid that trans people are harming lesbians https://www.independent.co.uk/voices/jk-rowling-transphobia-lesbian-feminism-blm-harry-potter-a9556296.html

-Afraid that accepting trans people will erase the female biological sex. https://twitter.com/jk_rowling/status/1269382518362509313

So she's not transphobic, she's just afraid of trans people, that's all.

It's not like transphobia literally means afraid of trans people or anything.

Transphobia: Trans - trans people, phobia - fear of. Transphobia-fear of trans people.