Wow, nice find on that link! I used to browse really old threads (some of them are fascinating) but never came across this one, and it's a great idea to make it visible again.
I knew about that topic by one of prominent users, months ago. As I answered below, it has actually been mentioned in
Unofficial list of (official) Bitcointalk.org rules, guidelines, FAQ, but something like buried in the mud. Consequently, there is very little readers notice about that point.

There are some seriously bad thread titles in sections like Economics and Bitcoin/Altcoin Discussion. I don't know how many I've come across where the title is "Bitcoin" or something extremely vague like that. I think I've even reported a couple of threads because the title was waaay too vague. Then there are threads in the English section where it's blatantly obvious the thread starters know zero English--some of them are almost laughably bad.
Newcomers to the forum should definitely be schooled in how to write a nice, concise thread title which also makes it clear what the thread is about. I'm hoping this here thread gets some views, because it's pretty useful. Props, OP. It's one of those forum issues that never really gets addressed because it's more of an annoyance than a major problem.
It is same as one thread I saw yesterday,
Bitcoin Beginner Question / PLEASE HELP. A real newbie (not spammer) asked for help, but if we simply look at topic title, we don't know what that users need. I gave him/her my advice, but it seems s/he did not care about it. I also have a feeling like only good posters care about their topic title.
In my opinion, that thread by theymos should be a sticky thread on the beginners and help board or should be added to the
HELP option of the forum as a
hint for users seeking help on how to properly use the forum posting options.
It has already mentioned in one of pinned threads:
Unofficial list of (official) Bitcointalk.org rules, guidelines, FAQIf one is lazy enough to ignore that thread, s/he will be lazy enough to ignore another pinned thread if there is a special thread for Topic title style guide.