At any rate, if someone moves from East Austin to Del Valle or Manor, are they 'forced out of Austin'? Even if that move affords their family a larger living space? These are satellite communities only a couple miles further out of the city center.

No doubt East Austin has gotten much more expensive in the past 10 years, as the article underscores. There's still quite a bit of low income housing, but it's certainly making up a smaller portion. As the downtown corridor jumps across I-35 and expands east, more and more high rises are being built in East Austin, where older ranch houses and traditional neighborhoods used to exist.

The thing is, many of these older ranch houses on the east side aren't even in great shape and don't really fit modern standards. They have character, sure, but raising a family in a small, wooden, 2/1 or 3/1 1950s ranch house with bad upkeep is not necessarily a desirable thing. Migratory data alone is not enough to interpret the story.