I think it was closer to 12%. 12%, I believe, is the point at which the boys who make the magic kill themselves off. Most natural wines are around 12%, if I remember correctly. Please feel free to correct where needed.
After the yeasts die off, the zymase is still around. That's why the added sugar will carbonate the bottle, even in a perfectly clarified lager that supposedly has no free yeast cells.
From what I can recall, it would not surprise me, since by the end of a Quart bottle, remembering where I lived was a chore...Not impossible, just to hard to bother with.
Damn, I am going to make some! :-)