He has JavaScript disabled. The code samples are provided by github's gist stuff. It's an interesting example of JavaScript being used to render rather than enhance, complete with a lack of graceful fail.

The interesting thing is that ember.js does exactly that. This guy will not like ember if he's browsing around with JS disabled.

Well, if he's like me, he has it selectively enabled/whitelisted for trusted sites (NoScript or Chrome's JS settings).

If you have javascript disabled you should be used to pages not rendering sometimes, not the best practice, but common enough to not be surprised if something is off.

If by interesting you mean "commonplace," I'm right there with ya. It's frustrating, but in the age of hashbangs it's a common failure mode.