It's hard to tell where's spoilers... and harder to guess what's inside a "Twilight Princess sprites", and I did it at my own risk and not blaming anyone...
However, the letters "TP" or "Twilight Princess" are quite far from being a direct synonym to extreme spoilers...
well... extrem spoilers? in a zelda game? in "THAT" link?
EXTREM SPOILER!!!: Link is a normal guy, he goes out to save someone, meets new freinds who help him, meets the evil, finds a sword and destroys the evil, end.
and "that" link, what does it have? Link with things out of the trailer, a guy people dont know, and zelda... suprise suprise, zelda is in the game called zelda
its not far from beeing a synonym to spilers, : all who doesnt have played tp = all tp topics are spoiler, all who doesnt have beaten it yet and see a "dontknowguy from tp" topic = spoilers, all who have beaten tp: no spoilers
its very simple
edit:
You are not looking for Twilight Princess spoilers, but others have given them away in their titles. If you look in a Twilight Princess topic though, then you are open for spoilers. They should not be given away in the title though. And that is what the rule is for.
people cant even put request in their topics... and when they make a "omgozors, my own sprited link [contains spoilers]" title, then you still dont know which kind of spoilers, or if its a spoiler for you.
example:
i never played zelda 2, i didnt beat oot or mm, i never played oos, and didnt beat la, i couldnt even play tp.
did ANYONE care before tp about spoilers?
if you make a topic in misc, kirby/mario/etc. Sprite... do the guys care about spoilers there?
its just a thing about the author of the topic... if he creates a topic, it should mirror its content, if it doesnt then the spoiler rule not nessesary, because it just would cut the popularity of those topics.
and i dont think that anyone cares about spoilers besides of tp spoiler