OK I'll bite. What do you think the motive is?
According to the post's byline, it was written by Neel Mehta and Billy Leonard of the Threat Analysis Group at Google. Are you questioning their professional judgement and claiming they are individually biased?
If not, are you suggesting that there is some management directive to look for Windows exploits and publish them on an aggressive timeline in order to embarrass Microsoft publicly? Do you think professional security researchers would abide by such a directive?