Although it is true that China would make propaganda posts, there is a much simpler explanation here. Let's go with the simple explanation. People are creating fresh accounts to avoid the wrath of people who support Muslims.

You don't have to be generally pro-China to be fully in support of what China is doing. You can hate the Uighers (Muslims) even if you also hate China. When you see your enemies fighting, you can pick the side you find to be less-bad or you can just cheer the fight in the hope that both suffer.