Today, Xinjiang is solidly middle of the lack today in both GDP/capita and median income. Meanwhile, minority groups in Xinjiang have progressively narrowed the income gap over the years while in other provinces, Manchu and Hui people have almost eliminated the gap entirely. You're free to read the studies, but a good chunk of them are in Chinese. What is known is that, as a result, terrorist attacks have basically been eradicated. Looking at the data, whatever China has done is clearly working. It's simple, really: income go up, radicalization go down. China brought income up, and radicalization go down.