It's true that it's possible to live without access to the Network, people did up until the Treaty of Bern (in 1874) - it is also possible to live without access to electricity, or fresh water and people did that too, they're still utilities.
Im not sure a person using an internet connected ATM would count, or a person who uses the internet in some form at work but does not have a broadband connection at home etc
If you count indirect usage, I suspect the figure is much higher - ie do we really believe that c13% of Europe manages to get through a month without using the internet in any form? I’m a bit sceptical on this data as it appears to be poorly explained in terms of methodology (and some is even just forecast through a model).