Of course, the Chinese government will do everything to ensure you see what they want you to see. The thing is, if you go inside the mosques, they post regulations on the walls specifically saying minors cannot be allowed, that preaching is, for example, for 30 minutes, and they only use their own imams and mullahs trained by the government, not the individual clerics who train elsewhere. In all of those regulations, if you read them, all those imams and mullahs are supposed to strictly follow government guidelines in terms of their clerical activities.
If you just go to mosques and see people praying and try to talk to a Uyghur, and you tap on his or her shoulder and ask them what religious freedom is, or things like that, you can see the fear on their face. But when they say things, they would say they have their religious freedom and are living their best lives under Chinese rule.