Same for u,source? It can be possible. Nobody from us know whats going on there. In this time where we life we simply do not know what is true and what not. Just look at the Median and tv how much propaganda there is without any facts or only lies. its horrible how grovements,concerns and other peoples try to blend us with fake information.
1. This hack isn't China's hacking style. The malware and infrastructure used were linked to North Korea in previous attacks
2. China and North Korea isn't on very good terms now. Especially after the North killed Jang Sung taek, who was friendly to China.
Also, it will make sense for the USA to ask for China's help. All traffic from North Korea goes through China, and so tracing the attack would be easy with China's help. And if China is really irritated by the North they could just shut off the North's internet.