I would suggest reading the original report. https://oxis.oii.ox.ac.uk/wp-content/uploads/sites/43/2019/0...
Quite interesting to see that the majority of people who don't want to join the internet is because of choice and worry that they will lose their privacy.
Anyone done a study of how people who don't use the internet usually vote in elections and generally feel socially about the rest of the world?