I'm not sure I agree with the opinion that they should've used a Chinese model for the cover. That's like saying Vogue US should only have Americans covering their September issue (since the year 2000, there have been 8 Americans cover the Sept issue - so exactly half the time). The cover stars should either be people who are culturally relevant in the country (as has been the case for Vogue US since 2000, including all their non-American cover stars) or should just be an excellent fashion image (as is the case here - in my opinion). Whether or not Vogue China chooses Chinese cover stars depends largely on their mandate with regards to having the cover star carry some cultural significance.