The "modules" feature documented on that page is Clang-specific functionality. The article is talking about the newer Modules TS, which is currently in the sta

The "modules" feature documented on that page is Clang-specific functionality. The article is talking about the newer Modules TS, which is currently in the standardization process, and works completely differently. However, as to your specific question, both Clang modules and the Modules TS aim to support replacing #include entirely with module imports, including within a single project.