Well, this may not clarify, but here's what she said. For the record, I'm really sorry I didn't grill her more on this -- if I get a chance to talk to her I will, and will post the results here...
As I understand it, he just decided upon one attempted return that he wasn't having it any more. It is possible that she was told during one return that if she left again that was it. Again, I'm sorry I didn't ask more... So I'm not sure if that is tough love, it sounds like he was just done.
What she said was that him putting his foot down stopped her from backing and forthing, which she knows that she would have continued to do otherwise. Well, yes it would stop that, -- he had closed the door. I don't actually know how long it was open for; I get the impression that not very long.
Regarding 'waking up'; she never wanted to divorce, so it wasn't that which made her 'realise' that she wanted him per se. I think you are right in that she got to these insights only after her 'nap' (well put, that...). And yes, it would seem that her current H is benefiting. As is she from his insights.
So in that sense it's a different story; we hear so many about the MLCer being miserable for the rest of their lives. She isn't, but she does say that this wasn't the way to do it. That she wishes she had known how to ask for what she needed back then, rather than just expect that it would be provided.
But in her case the LBS really did close the door, so in truth he doesn't care. So no, the ultimatum didn't 'do' it. And he didn't stand at all, so in that sense is very different from us. I'm not sure if he ever did any mirror work, as he found a new wife quickly and just went on.