Yes, that is what I thought, too. (It would be a good idea to have a open source C/C++ extension anyways, whether or not the proprietary extension stops working with non-Microsoft code.) (Maybe there is such extension; I don't know; I don't use VS Code and VS Codium etc.)

clangd, that is the extension. a lot better than the prioprietary trash microsoft pulls onto the store. open source, too.