As the global economic intelligentsia debates how to “decouple” or “de-risk” from China, Elon Musk clearly didn’t get the memo. The Tesla founder was feted like a returning king in Beijing this week. From the moment his private jet arrived on Tuesday, Musk is reportedly being called “Brother Ma,” putting him in rarified league with Alibaba billionaire Jack Ma. There are many takeaways from Musk’s first China visit in three years. One is that not everyone is decoupling from China, least of all the globe’s most influential electric-vehicle (EV) evangelist and owner of Twitter. Another: the future of EV production...