I worked, long ago, at the group in QinetiQ that got hacked. A couple of observations:
1. The Talon project (the robot pictured) is not, in fact, super secret. I worked with the Talon platform, and while my projects were "confidential", it wasn't some super secret thing. Would the government rather not have the Chinese have that IP? Of course. Is it at a security disaster? Hardly. That's not to say that they didn't have other, much more secretive, projects that were also compromised; it's just that the stuff being reported in this article isn't, like, nuclear launch codes.
2. IT security there (and, as I understand it, at similar government contractors) really was laughable. Total cowboy land. Assuming it hasn't revolutionized its security and culture, this attack didn't need to be some amazing exploit; it may have been a phishing attack or something similarly straightforward. So while the article lacks details, I'm not sure there's anything interesting to find here about the merits of the attack.
FWIW.