He's saying that China doesn't put up with Islam and they should, quote, do their thing. This seems to imply that Alex has no problem with the Chinese treatment of Muslims. This just doesn't square with how whenever he wants to attack China, Alex will bring up their treatment of the Uighur people. This is just so indicative of how everything is a tool for Alex. The plight of the Uighurs is useful whenever he needs to attack China, but it's not so useful when he's trying to make people scared of Islam.