Jewish source – that is true, but it doesn’t sound like this guy is too rigid or is unhappy. Not using internet is not being rigid if not using internet makes you happier. I think that LB thinks that it is rigid because for her it would be, but that doesn’t mean it is for him.
Personally, I am much happier and feel much free’er and connected to Hashem when I am in a house or room where there is no internet.
When someone is closed off from any secular things, they are actually much free’er and more open and less rigid, because they are more open to Torah and Avodas Hashem.
But that is only the case if it is real.