This is only true when there is some context establishing recency. If I mail you a letter, that is recent and may be assumed to be in the current year. If I find a letter in my grandparents’ attic, I should not assume that it is from the current year. It may have just been moved to the attic yesterday, or it may have been decades before.

For a post about processors from the 70s, there is no default assumption of recency. This post is on Google Groups, which has existed since 2001, and which is a gateway server to Usenet groups that predate it. Absolutely nothing about it gives a shared context in which the absence of a year can be reasonably assumed to be the current year.

I think they specifically meant in the context of this site. When the title doesn’t have a date here, the assumption is more-or-less “fairly recent.”

It is an odd post though, it really is like just a couple comments, and then the real content is in a link in one of the comments

https://trixter.oldskool.org/2011/06/04/at-a-disadvantage/

So the actual content is a 2011 article talking about historical processors.

Only the Groups discussion is contemporary and the actual content is a decade old. Making assumptions about dates is really fucking stupid. Mind bogglingly so. Even an abbreviated year like "'23" is better than nothing.