Per SpringBokVol, on a thread that I don't even want to attempt to find at this point, the "retirement" was by mutual decision.
I read this as CBB being told that he needed to do this, that, and the other, and he didn't much want to, and so they agreed to go their separate ways.
Anyone who has been employed for a couple of decades or so in the real world will realize that this sort of thing happens, through no particular fault by either side, and IMO it was a pretty classy way of handling it. Certainly better than being kicked to the curb, as happens so often these days.
And FWIW (not much), I count SpringBokVol as one of the knowledgeable insiders around here, and I'm way more inclined to believe what he wrote about all this.