In other words, every job ever created. That's economic segregation writ whole.
You've got to look at the actual data rather than relying on summaries. Service workers are not highly segregated in any American metro. They are evenly dispersed everywhere. Ditto with the creative class.
The service workers are not segregated in Austin. The creative class is not segregated in Austin. The measure the authors use show this. They are just slightly less dispersed here than in some other cities. It's like arguing which of a bunch of 5'6" guys is really the shortest.
Meanwhile, cities with much more dramatic levels of income segregation (e.g., Memphis, Cleveland) get a pass.
It's a pretty dumb ranking -- the sociological equivalent of one of those "most livable city" rankings.