That firmware update is very confusing, there are two different SPI updates listed the 2011-10-28 and the 2011-09-07, the Android 2.3 PDF instructions initially references the 09-07 update which is a separate download but then link to the 10-28 update in the PDF.
The 10-28 update appears to contain SPI updates bundled together as one update for various players unlike the 09-07 update.
I tried the 10-28 update and it would not update my ATV2000 running the kdgteam beta firmware.
Incidentally the kdgteam beta firmware online firmware update appears to show an update available but I've not tried installing it yet. I think I will wait for the kgdteam firmware updates they at least seem to work for updating the player properly.