(Disclosure: I work for Google, speaking only for myself)
What stuck out to me and got me looking for timing information, though, was that it doesn't feel well integrated. There are ways to update old articles so that they are fully current, but this one is mostly taking an old article and adding more examples without thinking about how this affects the overall argument.
Excerpt from the linked article: In these two case studies, all that was changed was the time stamp on the blog post. In both studies, the sample posts received a more than 50% growth in traffic in the weeks following the update.
That seems awfully circumlocutious. It's interesting how the narrative has shifted from "SEO will kill knowledge" to "filter bubbles spread by hostile governments will kill knowledge" to something a little post-capitalist here like... "advertising will kill knowledge"?