I just finished reading through the thread you supplied. It seems the problem is some kind of problem between the newest update to iTunes and the newest update of iPhoto. It looks like events that are combined, or have large differences in the time/date stamp are what are getting split/duplicated/whatever when synced.
Obviously it isn't 100 predictable, or there would be a lot more people complaining.
Since the problem existed before this iOS update I suspect that your upgrade to 4.3.3 probably doesn't have much to do with it. You were just unlucky enough that the bug hit you while doing the syncs after the upgrade.
However only time will tell for sure. If lots other people who do the 4.3.3 upgrade run into the problem immediately after, maybe the upgrade can cause a similar problem, or maybe it only triggers the problem by reseting how photos sync, or something.
And of course, none of hat helps you at the moment. The thread ended without a solutions, which suggests Apple does not have a solution yet.
BTW, I've been running 4.3.3 since this morning, and done at least three syncs during and since. I checked, and I'm not having problems. But then all my last five events are simple imports, not merged or edited events that the thread suggests are the most likely to have problems. And again, my iPhoto app is not current.
