To be honest, I don't know whether or not the number of Muslim and/or Arab tourists to Beijing represent a significant portion. Any statistics anyone?
If this site is to be believed then China has a Muslim pouplationof over 24 million https://www.worldatlas.com/articles/countries-with-the-large...
The reason is that Christians and Jews are "people of the book" according to Islam. That means that actually their slaughter is also halal, except for pork of course. So actually per sharia law halal slaughter is not necessary in countries they deem as people of the book. They still prefer it.
In China, however, or any other country that is non-Jewish, Christian, or Muslim, their slaughter can never be halal. In these countries the Muslims may only eat seafood and vegetables.