Actually, I have to disagree with the reasons for why they chose Vista to demonstrate the flaws.
What would be the impact if they said: "Linux is vulnerable to this."? Well, I would have read over it and thought: "yeah, nice to know but doesn't really bother me." and so would have done 95%+ of all other readers.
But when they say: "Windows Vista and probably XP are vulnerable to it" then it's getting interesting. Millions of people run that operating system on a daily base. All of them have now a big problem... wow! That's something that gives them fame and glory.