I found the following blog post about the experience of Mendix demo or training(?). http://blog.avisi.nl/2012/03/14/techdays-januari-2012-mendix/ In it, the author writes that "the artifact of the deployment is a WAR-file that can be deployed in any web container on any platform." Is this correct? If so, is it possible to generate war file from modeler? Or, is it an artifact produced when a model is deployed on the server? Which section of the 3.0 reference document should I look at for details?
I don't know where the guy in your link got his information but deploying in Mendix does not generate WAR-files. Is there a specific use-case you're after?