It is not an absolute ban on foreigners entering China: the official announcement makes clear that foreigners may be granted visas to enter China in certain cases:

"Foreign nationals coming to China for necessary economic, trade, scientific or technological activities or out of emergency humanitarian needs may apply for visas at Chinese embassies or consulates. Entry by foreign nationals with visas issued after this announcement will not be affected."

How the OP would demonstrate that necessary trade activities require his travel to China, I do not know. But the door is there. He'll have to knock to see how widely it will open.

http://www.fmprc.gov.cn/mfa_eng/wjbxw/t1761867.shtml