I think this essay conflates the notion of privacy and property and goes off the rails from there. I get what he's trying to say, but I don't think it has much to do with the the ordinary sense of the word privacy. If he's saying that the boundary between the individual and the collective is a core social construct, then, sure. But there are other, much better discussions of that topic, going back thousands of years.
Privacy is just another way the author states personal boundaries. and I think what the author is trying to state is there is a dossier of GPS locations, messages, and contacts you have made available to the Tech Giants and in the future they may not be as benevolent as they are now. They may be able to create an environment of chaos like throwing the damned into a colosseum to tear each other apart for their own amusement. Who knows? The people who run this industry are aloof billionaires. I don't know what future they have in store for all of us anymore than you or the author does.
