The way they're defining the amount of data you consume is pretty clumsy. I suppose playing a video game for an hour can be considered consuming n GBs, but it's not a terribly useful metric. What if I glance at a few very high resolution photos? Have I now doubled by data consumption? I guess technically I have, but it's not really useful.
The 34gb number seems a little BS in my opinion (for example, it mentions that 16GB of that value comes from video games), but the figure that surprised me most: "the average American consumes a whopping [...] 100,000 words of information per day"