> Your linked source is talking about an entirely different issue.
It's a court ruling that shut down North Carolina voter ID and early voting laws, in part because the defense of those laws included that that literal quote about it making harder for black people to vote.
> All we know is that some Republicans are biased, just as all people have biases.
When 'some' is enough to control a state legislature, and similar things happen across the country (https://www.npr.org/2018/10/23/659784277/republican-voter-su...), it's a logical conclusion.
> Also, your source is not substantiated.
It literally links directly to the court judgement.