I'm thinking that this is what it looks like: a support bulletin designed to keep them from being overwhelmed by people who fire up their iPods and can't get things to work just right, once they have installed Vista.

It's a new OS, with lots of restrictions that the previous version did not have, so naturally some things probably don't work as well as they should. Also, cranking out new versions for Vista may not have been the biggest priority around Apple, aside from the guys who knew that things were going to get busy there in apple support land.