It appears that no matter which group of members you are "in" Pending,That's because Download (and Bulk Remove) is its own tab, not controlled by the selection on the first tab.
I wanted to compile some figures on unsubscribes (Left vs Spam Left)For that wouldn't you need an export of the Activity log instead? Or in a Premium group does the "Past" list make that distinction (Left vs. Spam Left)? - I don't have any examples of Spam Left in my one Premium group.
And if so, perhaps the better solution would be to make that information additional enumerations of the "Status" and/or "User Status" fields of the export.
Hmm, speaking of which, I wonder what the User Status "2=Inactive" means. Again no examples in my Premium group.