The problem is, that's the completely opposite of what the Supreme Court said in their ruling. They emphatically said overt dilution of Black vote is absolutely illegal.
It was the heart of their ruling.
So the problem is that these protests rooted in claims that informed folks know to be false just end up looking foolish and misinformed.
It's like a protest saying that our government needs to address the flat earth issue. The protesters won't make much headway.
And in this case it serves to sully the whole idea of Selma.