Nonetheless, he claimed in this post that he was speaking as Adobe's representative. In my mind, if you explicitly make that claim, all the disclaimers in the boilerplate avail you nothing.

The fact that Adobe has some editorial control of it (even after the fact) means that Adobe is concerned that the personal opinions of their official representative may reflect badly on Adobe. There's no absolute choice here between "official Adobe blog" and "personal blog" -- it's somewhere in the middle. The only way it could truly be one guy's personal opinion is if he remained completely anonymous.