Glad to hear they’re doing this. That said, of course, one Chinese traveler or even non-Chinese traveler on a plane from anywhere could be carrying it....however, so far it has only been found in Japan, in a Chinese national resident in Japan (who recovered). So just checking travelers from China is a good start.
Better to do this than close the barn door after the epidemic is out.
The big question is why with just a handful of deaths that this is more important than screening for such diseases like ebola that has infected many more?