I'm not sure the article is accurate regarding apps, or it might be some Canonical talking point that obscured the issue, but "QML" implies you can write Qt apps that are "native" to the Ubuntu phone environment.
You can write native or HTML5 apps for the phone. Scopes themselves give you different ways of looking at content. The first couple of pages of Ubuntu Developer give the best information (http://developer.ubuntu.com/en/)
