Docs site pages can have a footer that contains a "last updated" date that is computed from git history. We used to have the option to show this date turned on, and it appeared to be accurate when running the docs site locally and on the Netlify site. However, on the official live site, all of the dates were the same and reflected (I think) the latest build that was deployed to doc.wikimedia.org.

Landing page on the Netlify site (when we had the "last updated" date turned on):

Landing page on the doc.wikimedia.org site (ditto):

As part of T308488 we removed the "last updated" text by removing the lastUpdatedText theme config property from our VitePress config. Ideally, we would add it back in and show the correct date that the file in question was updated.