Not being the one who made the assertion, I was simply attempting to illustrate that very long-standing security holes can and do exist in modern operating systems in common use. I'm not here to defend that assertion as it is not necessarily correct (most security holes in 8.1 are as-yet undiscovered since the OS itself is quite new!) The bugs I've pointed out existed for many years before being found and fixed. The standard response to "open source is better because people can find and fix the bugs" is to wait for a bug to appear, then screech loudly about how the existence of the bug shows that open source is a fatally flawed security-hole-ridden model of software development, blah blah blah ad nauseam. Clearly this is complete and utter bullshit since an infinite pool of available code reviewers != all bugs preemptively fixed, but such is the process of arguing with zealots on the Internet, so the next best thing is to illustrate that closed source is no better than open source.
I'd like to point out that in one of my other comments here, I've tried to explain that Apple's critical SSL bug was there for years even though Apple leverages the full advantages of both closed- and open-source models in their Darwin kernel. If that happened despite having the positives of BOTH models available, how the hell is anyone in either-or supposed to avoid making the same mistakes? Humans code, humans commit errors, end of discussion.