They only use flash on the desktop site. If you spoof your user agent to that of a mobile device, you get exactly the same site, except with html5 video.

I don't fully understand the reason for not using html5 video when on desktop, it functions perfectly.

I think their problem is that they've become a bit of a content factory, which links back to the whole freelancers thing. They churn out a lot of articles, and some are much better than others. It's the shotgun approach to getting views.