"I talk about confronting the justice system, confronting the policing that's going on, I'm talking about speaking up," she said. I'm talking about legislation. I'm talking about elected officials doing what needs to be done to control their budgets and to pass legislation."
Waters told CNN on Monday evening that her reference to confrontation was meant in the context of the civil rights movement's nonviolent history, saying that "the whole civil rights movement is confrontation." When pressed on the judge presiding over Chauvin's trial having said that her remarks could be grounds for an appeal, Waters replied, "Oh no, no they didn't."
That's from your own link. Waters clarified her comments and nowhere there does she advocate violence.