Why doesn't Delingha let foreigners stay in hotels?

Delingha, Golmud and other Qinghai border towns belong to military or other controlled areas. For non-foreign hotels, foreigners are not allowed to stay. This statement is inappropriate, because you need to register when you check in, and the registration record will be transmitted to the public security system. As long as the procedure is followed, it is legal. Delingha, Golmud and other Qinghai border cities belong to military or other controlled areas, and they need to apply in advance or have documents submitted by travel agencies.