It absolutely does matter. If I'm editing the file in which the package-scope variable (or type, or const) is declared (and also referenced) and decide on the fly to subtly change its semantics, forgetting that the same is also referenced from some other file within the package, I have likely just created a bug. Worse, the bug will likely manifest itself only at run time.
A human typed in something less precise than you'd like in a style guide. Find a bug tracker to request a verbiage change. It's not that big of a deal.
No one is asserting that variables are in fact file scoped.
