That's not true. If you only have a secret clearance then you're not supposed to read top secret material anywhere (unless you're "need to know") - home nor at work nor on the moon.
You missed the context. The point is that people are still free to go to the Guardian on their home computers and exercise their own judgment in what they read. However, the Army is taking proactive steps to avoid a mess of work cleaning up their own systems.
Right. As long as they use that judgement to avoid reading classified information. ;-)
> Army is taking proactive steps
As far as I understand (and please note that I'm not an expert) they have always blocked certain kinds of sites. That Guardian is added is not really surprising, but the indirect refusal to own up to it is whacky.