Earlier quoted context omitted.
What "calculable metrics?" By what definition of "sovereign?" Objectively, this is a meaningless statement to me.
Which countries force you where to live and what job to work at?
But unless you hunt and grow your own food, own your own land and aren't subject to laws or government that owns your identity and tells you where you can go and what you can do, you aren't sovereign. If you have to spend the majority of your useful life trading your labor to a corporation, you aren't sovereign even if the market gives you the option of which feudal lord to serve as vassal to. If you require modern technological society, the infrastructure of agriculture and healthcare, for your survival, you aren't sovereign. There is a reason that word is synonymous with "ruler" or "king," it's a status that very few people, particularly in modern society, can claim.