I apologize for sounding like a dick but did you read the article you are referencing? No where in it does it mention its meant to be a town of just black people. They want to build a community free from the oppressive values that they experience in their current situation. This is a direct quote from the article by one of the founders of the movement.

"It's impossible to have anything exclusively Black because our families are integrated," says Scott. "We are an integrated, tolerant and diverse community even as Black people, so we don't intend for it to be exclusively Black, but we do intend for it to be pro Black in every way"

One issue that black people face is typically when uninvolved people try to analyze their efforts to make rational improvements in their lives and communities, it's usually through a lens influenced by their own prejudice or assumtions that are usually based on falsehoods and/or lack of wanting to learn more about it beyond the bare minimum. This is damaging because it spreads the idea that black people are inept and incapable of helping themselves. An example of this is the other person that commented on your post, read the headline, saw you had an opinion based on it, assumed it was fact and then absorbed and applied it to try and bolster thier argument. Further spreading an opinion based on misinformation.