Right. For me (and maybe other commenters as well) the term "citizen" implies paying taxes to an armed entity in exchange for some protection and rights. So "global citizen" in this sense definitely implies some form of a global government. But of course the article doesn't talk about anything like that. I guess it intentionally uses the flashy term "global citizen" when its main message could be expressed simply as "more and more people don't feel much loyalty for their respective states".