She supports Israel which is enough to qualify one as pro genocide (You mistyped there... unless) and an anti semite as Israel is the number one current-day cause of antisemitism with the constant blatant weaponizing of past traumas and horrors in some insane attempt to justify doing current genocide and generally being the most annoying and evil nation on earth... making Americans somehow seem normal.

It's a reference to the goblins from Harry Potter which are Jewish stereotypes in the book and in the movie the bank the goblins work in has a giant star of David on the floor (because the actual bank they were using had one, this is not really Joannes fault).

The ADL (?) determined that this was a case of cultural anti-Semitism and that Joanne didn't really do anything wrong, she was just using tropes without examining them.

Of course then the Harry Potter game doubled down on the Goblin-Jewish connection by adding in a Shofar and explicit reference to the Fettmilch uprising.

She wrote a spin-off book where there's a heroic magical effort to stop a villain from preventing the Holocaust.

*pro-genocide