10 weeks is not just bug fixes and balance time for any game company. It's crunch time, where everyone is working huge hours to fit all the pieces together. Probably 80-90% of the content is done or near done in their separate places (e.g., models, writing, quest design), but it all needs to put together. Testing, balance, and bug fixes also can be iterative process, where testers do small areas at a time, report bugs, balance, feedback. Obviously some holistic testing like going through a whole playthrough is needed for that true final coat of balance polish, but there's still time for that (and for all we know the main quest and combats and all that can be played through for the most part already, just without the full scripting and dialogs and whatnot.)
I don't think a recent GOTY winner on the precipice of a game that's clearly going to be far better than that GOTY would have that much trouble finding funders to pay for an extra month of development.
