The most interesting part (to me) is not touched on in the article - if expensive jobs can be done remotely from Gary, Indiana, they're not going to go to Gary natives who are currently underemployed, but to the same small crowd of well-off people who are just going to move to Gary, driving prices there up. I think this is the inequality that is interesting and matters.
In addition, well-off people are interested in making sure their kids get a good education. So maybe they start pushing the city to improve public education. In addition, the increased home values and increased businesses are likely to result in greater increase in tax revenue, allowing more money to go to education.
And the nice part is that Gary, Indiana got these benefits without having to try to bribe a large corporation to open an office with tax giveaways.
You may or may not have more inequality, but I would argue that the people in Gary would be better off.