[Android][Question] Tutorial 2 memory leak inner class question

I'm at the beginning of tutorial 2, seeing a strange non-static inner class:

@RibInteractor
public class RootInteractor extends Interactor<RootInteractor.RootPresenter, RootRouter> {
    //...
    class LoggedOutListener implements LoggedOutInteractor.Listener {
    @Override
    public void login(String userName) {
      // Switch to logged in. Let’s just ignore userName for now.
      getRouter().detachLoggedOut();
      getRouter().attachLoggedIn();
    }
  }
}

Also, the login listener is referenced by a very strange syntax in RootBuilder: rootInteractor.new LoggedOutListener()
What is that?

Start with tutorial 2's RootInteractor and RootBuilder references shown in the issue. Review the non-static LoggedOutListener declaration and the rootInteractor.new LoggedOutListener() usage, including the reported memory-leak concern. Done means providing a clear explanation of both constructs and their lifecycle implications.