That article's commentary on dating articles is largely complaining about HN's policy. You can still stick a date somewhere on your page - put it at the footer, and anyone who gets that far will already have invested enough in the article to have at least scrolled down a bit.
> That article's commentary on dating articles is largely complaining about HN's policy.
No, it is using the observed effect of HN's policy as a piece of evidence for the broader claim that using dates is bad content marketing because it leads people to discount the dated content as it ages; the thesis is that, to maximize the value people ascribe to your content, you should avoid dates.