Oh, yeah. The full thing was, what? "Setting free, but we're using classic D&D personalities like Vecna, Bigby, et cetera."
I guess what I'm envisioning is something like the world you'd get if you took all of the proper names in the core rules (minus the Greyhawk gods, per the mention of Thor and Odin and co.), and created a bare-bones setting where Mordenkainen and Tenser were great mages of the past, and Asmodeus rules the Nine Hells while Orcus prowls the Abyss, et cetera.
A lot of very early Third Edition campaigns were like this, although they used the core pantheon - they weren't Greyhawk games, they were homebrew settings, but they used these proper names because they were in the rules.
Edit: I guess the Greyhawk personalities in the spell list muddle the issue a little, but otherwise you can imagine a world that's located within the D&D cosmology - uses the Great Wheel, for instance - without actually being a specific, published setting.