I suppose these articles aren't timestamped on purpose, but that is really annoying.
Copyright © 2010, 2013, 2015, 2016, 2018 Richard Stallman
Updated: $Date: 2018/12/15 14:02:39 $
There's a token pattern you can put into files that gets updated at commit time.
I think they're written in a neutral tone which is supposed to withstand the test of time, plus edited for corrections, but I do agree that it'd be nice to dates for some context.
(It would appear that the original article was published in 2010.)