"Unpatched government PCs may become sitting ducks" - Absolute rubbish and scare mongering. Most big companies an no doubt the Governments, have push updates via WSUS or similar service, so as long as they are on connected to the network or are WOL aware, they will give updated at some point.
Actually, many gov't and industry PCs don't push updates until the IT dept reviews the update set. There are a number of reasons, not limited to guarantees of security. Not to mention the statement is by itself completely valid - a PC that is unpatched is in fact a sitting duck to any exploit based on the issue that wasn't patched. As the article goes on to note, if no one is around to turn the computers on, how exactly are they supposed to update? Even if a service can push updates, there is still that window of continued vulnerability if the systems aren't actually up and running until after the folks get back to work.
I'm sort of amused by how Patch Tuesday is always a big event and people always bemoan the latest vulnerabilities in MS software. When Firefox or Chrome release updates, on the other hand, which usually include security fixes, they're called "new versions" so that's okay.