I've already tired to follow this guide a few months ago but found that it is too outdated to use. Basically, the sbs links are dead as Tizen moved from sbs to OBS (but unlike the MeeGo OBS, they don't provide access to the main OBS instance for normal developers) so the guide is no longer usable.

From how I understand it, EFL is basically used to implement the backend for the HTML stuff & any native built-in apps. I think they also expect that vendors would also use EFL to implement any built-in native apps they need when customizing Tizen for their devices. But no word about actually supporting third party native (or even hybrid native-HTML) applications.