Instagram/reddit/Snapchat/tik tok/forwarded whatsapp videos/hacker news/audio books/music are all media. And with a device that enables 24/7 consumption literally on a person 24/7, I don’t doubt it.
If you look at the graph, internet usage is a relatively small percentage of media usage. TV + Radio have roughly 2x the consumption of internet based media according to that graph. Which strikes me as odd, although the idea of people in transportation skewing the radio numbers is interesting