HN front page tends to concern itself with recently published news. It's a fair point that something doesn't have to be just-printed to be relevant, but I personally visit the front page and new page to stay up-to-date with what's new, and I appreciate the indicator of something that's not.

I don't find it hurtful.

This particular article is called "why delphi wont die" so i would say what year it was is very relevant.(even if 4-12 months)

I don't see a problem. When I see an article that has stood the test of time, I am more likely to read it.