I don’t understand, your link confirmed what I said. Any car foreign owned car companies that want to avoid import tariffs must start a joint venture with a Chinese company that has a 50% ownership. China’s Free Trade Zones exempt this requirements, but treats anything produced in the zone as a foreign produced good.
Tesla will produce in Shanghai Free Trade Zone, in which Tesla will be not be required to form a joint company, but the down side is Tesla will face import tariffs.
You mixing things up. EM wants 100 but officials haven’t agreed to it at all hence why EMs outreach to the monkey in the White House on Twitter. The local government is trying to continue as well 50/50 - what you describe is not reality yet