I don't think this is used for Windurst 6-2. because when i did it, we didn't camp to get a judgment key. Now, it is possible someone had the key. But I got one the other night while getting my coffer key for rdm af, and I took note of the description. "Opens the door to the top floor of Castle Oztroja" Just the fact that it says 'to the top' not 'at the top' makes me wonder. Of course i could be 100% wrong, but just thought i'd point that out.
and yea, this page needs to be updated so it's more clear.