All I understood from that rant is that (C++?) modules are not what I (a millennial) think they are
So I checked again and, as I thought, C++ modules obviously don't require headers, and consequently give considerable compile time improvement (which also saves development and debugging time) and don't use preprocessor, which translates to neater and more transferable code (not perfect, but always something). I'm sometimes curious what kind of a job and code some people do that they seem to be affected by every possible flaw of the C++ features... Luckily, I'm not one of them.
I had a chance to appreciate the effectiveness of using modules in Fortran in my old research institute, when I and my colleagues were able to import over 10-year-old code written by people we hadn't even met, and re-use it in a straightforward manner. I've heard that large firms have decisive power in the C++ standard development. Since modules are perfect for large projects (i.a. for the above reasons) I'm surprised that they didn't materialise in earlier versions.