Just FYI - This bug isn't the result of the Supplementals. It shows up in UOP 3.2.0 as well, so whatever the reason was for the variable condition being changed, it was done at least 3 years ago. Probably longer depending on how far back in the original changelog this goes.
Though it doesn't break anything serious, it will get included in a new update after someone found a bug that *IS* quest/game breaking enough to warrant an update.
Supplementals are indeed still being developed, well almost. There aren't that many fixes left. Here's the thread for the official Unofficial Obivion Patches: http://forums.bethsoft.com/index.php?/topic/1164539-relz-unofficial-oblivion-patch-320-unofficial-patch-supplementals/page__st__20
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Though it doesn't break anything serious, it will get included in a new update after someone found a bug that *IS* quest/game breaking enough to warrant an update.