Who said anything about stopping doing business with china??
What i said is that Elon expect that a right wing government would block, difficult or delay this single Chinese company from buying Sigma Lithium to help him to buy it instead..
Australia is doing the same think right now.. Australia is currently the largest exporter of Lithium in the world and Chinese companies tried to buy some mining companies there but the Australian government prohibited.. They said the Lithium mining is too important to the country and that they do not want China to control it..
There is some investigation going that China might have went ahead and acquired the mining companies in Australia indirectly via third-party companies and last i have seen Australia government had ordered those companies to sell their share or else they will seize then..
China is still one of the largest Australia trade partners, that did not stopped it from blocking the mining company acquisition..