While I'm not sure why Chinese government is not sharing the virus, I really don't like the way the article is written.
The entire article is about guessing the reasons and developing a conspiracy (even the relation to trade war). No response so far from the official channel of Chinese government.
Also for this section:
>> The Chinese government has refused to share clinical data from infected patients, according to scientists[1], and claims to have all but eradicated H7N9 through a single poultry vaccination campaign.
[1]: Citation needed.