If you hear a piece of “news” from China’s mainstream media, that’s not the news anymore. Normally, this “news” can be seen from multiple official outlets in China in similar or even the same words.
Therefore, you can trade on the news anyway; you should assume market has already priced this information.
The reason is that nowadays information transmits super efficiently in China, so little people would be left behind without the exposure to those mainstream “news”. Thus, there is no one you can have information edge over, especially in the market.
Then where/how to get information edge?
1/ by double checking the news with resourceful people. Context will matter a lot and they can help you understand for example whether a change is big / serious or superficial / repetitive.
2/ read the full documents; gather any information that is shortened or simplified in the news
3/ focus on news that is not repeated in other mainstream medias
4/ compare with previously similar events – look for anything that is more or less than before; in other words, result is not important, the difference matters.