“Republican Party is 99% White” is a myth. I know Republicans of every racial background. It takes a strong person to go against what they may feel is expected of them. I’m an American of bi-racial (White and American Indian) background and a strong Conservative Republican. Folks like me are rare.
I know that's a rather harsh assessment but that attitude leaks out too often to be an anomaly. If that's not the author's POV then my apologies to her. But it seems to be consistent with the views and attitudes of most black "civil rights" leaders.