the date tag on posts is not to indicate whether an article is deprecated vs current. presumably nearly every article posted is currently true (that's the "news" part). it's useful to hint whether it's interesting as a new thing, updated thing, or old but of current interest for some reason.
for the same reason that clickbait headlines draw you in, dates are good to wave you away.
for the same reason that clickbait headlines draw you in, dates are good to wave you away.