He repeatedly mentions Arabic as the local language instead of the various Turkic languages of the region, indicating that he most likely doesn't speak any of them, so he probably didn't have much interaction with less-educated people, who'd be the major targets of forced Mandarin education etc. So when he talks about people feeling safer now, is that representative of everyone in Xinjiang or just the people he chose to associate with?

It's not unlike a European visiting the US when they were busy killing natives and enslaving blacks, but being thoroughly enamored by their egalitarian democracy.