Yes, but what's important here is the storage duration, which the static keyword doesn't affect at file scope (it just affects the symbol scope).

Use of static in the context of that C snippet is deprecated in C++. One is supposed to use an unnamed namespace instead.

    namespace {
        int myfunc() {
            return 5;
        }
    
        int x;
        int y = 4;
        int z = myfunc();
     };

     int main()
     {}

In my opinion, his point is still valid.