Steve Yegge accidentally posted his rant to the wrong account. Google+ for apps wouldn't stop anyone from doing that, unless there's a way for administrators to ban employees from using their personal accounts during work hours.

In a subsequent post about his current project and conservative vs liberal coding he seem to have mentioned it was not accidental.

I'm downvoted here, maybe because I'm wrong and misunderstood the last sentence of Yegges post (1):

    (Special Note to my fellow Googlers:  
    Yes, I meant to post this externally.
    BOTH times. No, I am not the Mouth of
    Sauron.)

What can "BOTH times" mean, but that the first time, the "platform" rant, is included?

(1) https://plus.google.com/u/0/110981030061712822816/posts/KaSK...

My guess is that he accidentally posted it internally first and then posted it externally. And so, both times he posted it, he meant to post it externally.

As a sinister plot to trick other people into making the same mistake he did?

Mistakes _can_ be made with/without Google+. I agree that Google+ makes it a little too easy to make something like that. But that shouldnt be the measuring stick while evaluating the potential of such a tool.