The problem is, in almost all (if not all) cases, this information was wrong, and the site is already running the current version of the software in question. There's been a lot of buzz about these erroneous notices in the web hosting community, though I noticed it when I received the notice regarding a few sites I had personally updated last week.
It never hurts to confirm an update has been made, but this looks like an issue with Google's version detection software.
