How does LukeB_uk know that this is the document the article used to source that statement? Does he have an old copy? Genuinely curious as the page he's referr

How does LukeB_uk know that this is the document the article used to source that statement? Does he have an old copy? Genuinely curious as the page he's referred me to seems to document a U.S. only feature you need to specifically turn on when you update your status.