"linked data" can and should be a very general term referring to any structured data that is interlinked/interconnected.
It looks like most of this article describes it in that general sense, but sometimes it talks about URIs and such as if they are a necessary attribute of linked data, when that would only apply to Web-connected linked data. What about, for example, linked data that links to each other through some other convention such as just a "type" and "ID"? Maybe that shouldn't be considered linked data if it is too locally scoped? But that topic and distinction should be explored/discussed further...
I love its application to web technologies, but I wish there were a distinct term for that application ("linked web data"?) so it could be clearer from reading the word whether you meant general case or not. May not be a problem in practice. We shall see.
Granted/hopefully most use of linked data is in the context of the Web, so that the links are universal / globally scoped, etc.