Yes, the "story" is wrong in important ways.
I didn't say that Susan B Anthony was pro-slavery. I very specifically said that she was a white supremacist, she formed an organization of white supremacists, she kept out Black suffragettes, and she hindered Black people's access to the vote. Oh, and that she was a bad person.
Surprisingly, most white supremacists are not pro-slavery. Most famously, Abraham Lincoln was a self-admitted white supremacist, and also abolitionist