I don't think he was suggesting either. In the suggested setup, the webserver can still be used as a webserver, giving you the power of years of development into security, modules, etc, while proxying through certain requests requiring custom application work - which passes to your local webserver. Neither is what I'd consider the primary role of the application, though.

I'm not sure about uWSGI, but Gunicorn's default worker was designed to be behind a proxy that buffers slow clients.