Like I said it has nothing to do with you.
The subject tells what the topic is about, it doesn't really matter what you started, it represent the actual status and has nothing to do with you.
Also, like said before, a spoiler is a spoiler. Everything about content is a spoiler.
Just imagine you're a fresh player, everything about the story what you do not know till then is a spoiler.
Once again, it has not much to do with your initial post, every topic get sometimes it own 'live' and adjusting the subject is just something we have to do
Ps: just think about it, is this still spoiler free like you wanted?
You brought yourself a big spoiler viewtopic.php?f=6&t=16298&start=10#p51072
If someone didn't do that quest it's a spoiler for him and it doesn't matter if you talking about the newest update!
Edit: mentioning the telescope isn't really a spoiler, it's like saying there is a dungeon. You only understand that after getting there