That's a somewhat odd thing to say. StackOverflow would be better off not leaving dated topics for reference (as you can see when someone leaves a comment about how they wish the highest voted answer was actually up to date with the latest changes in that technology), and aspiring to be the StackOverflow of your niche is actually not such a bad idea (in the sense that they do allow and encourage updates to the answers). Besides, in some domains which overlap heavily with technology (e.g. marketing automation), writing timeless articles is pretty hard. Lastly, updating genuinely out of date content is a big favor for your readers and one that they will appreciate, even if your overall view is simply "Fk Google!".