Go back and look at the map, aside from the Eastbank of Jefferson Parish(white) and New Orleans East(black) most of the map is what you are describing.
Correct. It's the methodology of desribing N.O. as 63.3 segregated that is odd. It doesn't measure the amount of areas that are blended populations. It measures the number of people from a particular group that would have to move to create exactly equal proportions. That seems like a crappy way to determine the level of a city's segregation.
He starts the article with these paragraphs:
Racial segregation remains a problem in America, and it's lasting longer than anyone expected.
Just how bad things are can be determined through analysis of 2010 Census data.
He then says this:
The average black person lives in a neighborhood that is 45 percent black. Without segregation, his neighborhood would be only 13 percent black, according to professors John Logan and Brian Stults at Brown and Florida State.
What the heck is he talking about? Does every neighborhood have to be proportioned exactly to match racial make-up of an area to be considered desegreated? A black guy living in an area with 45% blacks and 55% whites or others doesn't sound too segregated to me.
Finally he says:
A score above 60 on the dissimilarity index is considered extreme.
Who decides what's extreme? Do you think New Orleans is "extremely segregated"? I don't.