visibility of private Class C in module named "C"; private variables in modules

[kdevel via Digitalmars-d-learn]

~~~Private.d
module Private;

class A {}
private class B {}
package class Private {
   void foo () { __PRETTY_FUNCTION__.writeln; }
}
~~~
~~~main.d
void main ()
{
   import Private: A; // okay
//   import Private: B; // main.d(4): Error: module Private 
member B
                        // is not visible from module main
                        // okay

//   import Private: Private; // main.d(8): Error: module Private 
member
                            // Private is not visible from module 
main
                            // oh-kay, but

   import Private;
   auto p = new Private; // works, but Private.Private is private 
?!?
   p.foo;
}
~~~

I don't get it. Furthermore according to

   https://wiki.dlang.org/Access_specifiers_and_visibility#private

there is always external linkage on private variables and 
functions.
Does D not provide a means to stop symbols from going into the 
object file?