(Disclaimer: I have 0 experience with Confluence and I'm a Stack Overflow employee.)
Is this info good or bad? The page was updated yesterday, but this part was written two years ago.
Worse, its down to arbitrary decisions by individuals what goes where, and search for answers and you get... surprise! Old pages no one wants to delete 'just in case'.
I think the real value here is that old answers are still important, but maybe they're not the right answer any more.
Confluence (and the wiki format in general) just fails time and time again at offering relevant timely information.
I get it, its like source control; just delete that stuff and update the page, its still in the history... but people just dont.
One of the biggest problems SO sites have is the prevalence of outdated info no one will ever update or remove.