Just a quick mention on the thread itself, it was languishing on page nine of the Eldar board before being resurrected. Eldar is still a relatively active board, so sixth month old threads there tend to be well down the list of pages.
Something that may not be commonly known is that, quite often, you get members who join a community, raise some old threads, and then disappear never to return. I've seen it before. In the case of the member in that thread, he doesn't know that the thread has been locked, since I moderated after he logged out, and he hasn't logged in since.
As far as forum policy is concerned, thread necromancy rules exist as a courtesy to other members. New and newer threads posted by active and current members are those which deserve the focus of attention, so raising old thread is discourteous to the community as a whole, unless it's something really profound which has a major impact on what was being discussed.
With respect to multiple threads on the subject, almost every subject gets recycled every few months or so. Long gargantuan threads like the old wishlisting thread for Eldar serve no purpose, because people stop reading all the replies, and start repeating earlier posts in the same thread, which is much worse.
New players coming into the game have questions which are the same as those in older threads, but often have a different context, and so it makes more sense to raise them again. Only in the case of the same topic being raised repeatedly in a short time frame is this a problem, and that's why we used to have a separate sticky for frequently raised topics in the Eldar board, but since nothing has been frequently asked for a good few years now, it ceased to be of much use, so it was unstickied.