Even though China has a huge population, so far they are drawing skating talents basically from one provinve, equivalent to a rather small nation. Their potential is unimaginably great if the sport becomes popular and attracts talents from the general population. I think with China, it's often a matter of if the government makes it a goal. E.g. They made incredible and shocking advance in diving, from having only 3 pools in the country to world dominence in a few years. This phenomenom has repeated in a number of sports, now including various expensive Western winter sports. However, I think these days the government is letting the natural development happen, other than financing training and taking care of virtually all aspects of their athletes' careers.
With more challenges, the sport's level will be lifted.
Domestically the callers have studied and broken it down until it's not able to be broken down anymore, and while it is done in a similar style of a toe axel and the take off is not textbook, it is not under-rotated. However, even if the callers were aware internationally and broke it down that much (never would happen), it is poor technique and he should be dinged in GOE regardless.
They were not too brilliant to let it go domestically knowing it would never get called internationally. They've done the kid a disservice by doing that. We always tell the kids to never leave a doubt and he more than leaves doubt about that rotation with that technique.
Oh and what I am most surprised with Nam's marks is that his transitions were so high, I'd have easily dropped them down a point or more - apparently dancing on 2 feet is acceptable these days as long as a few spread eagles are thrown in (especially when it is evident he has the ability for turns, etc as demonstrated by his footwork). It really irks me that such talent is being packaged so poorly and handled so terribly. Such a shame.