Jon Skeet (the person that answered the question) works for Google, has more than one blog, and rep caps on stackoverflow daily from old answers because he's answered so many questions there. He's written multiple books on Java and C#. He's plenty visible. Not to mention that the question is over two years old.
Plus, if you look at the guy who asked the question, he's a programmer from China, so it's not hard to imagine that had something to do with the fact that these dates popped up in development.
There's no conspiracy here.