Just one added factor that seems to be being ignored here is that Austin is the state capital of a still solidly Republican state, so a significant number of white Republicans from elsewhere in the state who otherwise would probably not prefer to live in Austin are going to live right next to the capitol building for work.
There might be some truth to that but then what about the fact that the precinct right next to the Capitol building in Bismarck, North Dakota is by far the most D precinct in Bismarck and the only one where Trump got under 50% in, and the only such precinct anywhere in North Dakota more than 10 miles from the Red River that isn't on a Reservation?
