It becomes much easier over time. I'm at a point where I could certainly accomplish this, especially now with great projects like CocoaPods. Experienced web developers can create a simple CMS lightyears faster than I can, its all relative.

Now what I find most interesting is that the author doesn't seem to have a large portfolio of apps. The "More by this Developer" link only shows this app, while his website only points to Discovr (http://discovr.info/) which I can't imagine he's the only developer for. I'd be curious to learn more about his expertise.