Unless you happen to live alone and interact with no one, basically every single interaction is undergirded by policies determined by humans. Politics. A computer/phone being built that is purchasable for legal tender, charged by electricity being fed into our homes, where we can send packets in the air, underground and across the world, doesn't happen by magic. It's literally the result of politics.
"Detaching oneself" really just means "not paying attention to politics". And it's a free world to do so, especially for mental health reasons. It's definitely not healthy to be tapped into news/current events all the time and I have to take breaks myself. But for some people, they can't really detach when their literal existence is deemed "political". This is what people refer to when they say it's privileged to detach.
Side Note: criticism of "detaching" is not referring to things like detaching for mental health. Internet trolls aside, that's a strawman argument. What it's referring to is the kind of people who say "oh, I'm just apolitical" or "tech is apolitical, it's just code", when really the status quo is in their favor and they have zero need to ever think about political issues. They would certainly not be "apolitical" if they were being banned from entering public bathrooms or being banned from contributing to F/OSS projects on the basis of their skin color!