Don't get me wrong, I have no issue with someone wanting things even 20+years ago spoilered, but unless I misunderstood what Stump said in that thread - there's a certain line that needs to be drawn between what is genuinely a spoiler and what we believe to be spoilers - we can't be rigid, we have to adapt to the situation (in this case, a game that was released in 2010 or a manga/anime that was released in 1990s).
If it's ok for you to be spoiled for a 20+ years old game then fine, but to me it matters. I don't want spoilers regardless how old the game is. Use the freaking spoiler tag if it's a major plot event of the game. If people want to read the spoiler they can click on the black bar so the text is revealed for them.
I may want to read spoilers too, but then I have choice to read them. But I do not want to read spoilers by accident.