They evidently didn't teach you to read since the rest of the paper shows your point is overblown, and the real issue is housing availability.

>Their research finds that gentrification had no discernible effect on income, employment or commuting distance for lower-income original residents, both those who were displaced and those who remained. That finding undermines the most boosterish case for gentrification, while also showing that it doesn’t massively undercut the material quality of life for poorer residents.

>The paper shows that much of the neighborhood demographic change was generated by newer, better-educated residents moving in rather than lower-income residents being forced out. That reinforces previous research, also released by the Philadelphia Federal Reserve, that found that demographic change in gentrifying neighborhoods was a result of typical levels of population churn in lower-income neighborhoods

> “That’s a reason we think you shouldn’t just design policy to protect people who are already there. If you are in a world where people just move a lot, and this change is happening through replacement effects, maybe you should make sure people can afford to move there in the future.”