Did he change because they started excommunication proceedings, or did they start excommunication proceedings because he changed? I didn't follow him closely enough to judge. Did you?
This wasn't exactly his first rodeo with church disciplinary proceedings. My understanding from reading the timelines that got put out publicly in December was that they had already harassed him before he delivered the 2012 address I quoted. He's had a foot out the door for some time, but I think that more than half of the officially counted members have that or more out the door. What he did was provide real reasons to stay while acknowledging that the reasons people had for doubting had a legitimate basis. That's the part of the "come back" message that most of the faithful miss out on. They don't actually deal with the other side's objections as real reasons for doubt.
I'm not really shocked you're going to get the most bitter version after it was already apparent he was going to get excommunicated. That seems eminently predictable.