So it should use the HTML5 video if you have opted into YouTube's HTML5 trial. This will only be used for new articles, but I went ahead and re-published the article you linked.

The solution is HTML5 video, but that relatively young technology requires further development to meet the needs — and DRM requirements — of a service like Netflix. According to the blog post ...

As the HTML5 Reset authors note, the code is by no means an “end-all and beat-all” set of templates. In fact, the code may not work for your project at all, but even you don’t end up using ...