The answer here is kind of misleading. Of course, he can’t be reinstated if he continues his current beliefs and actions. But, the hope is, he would change those, and repents his actions. As they state in the response, excommunication is for a person’s own benefit. We can all hope Mr. Bourgeois changes. For now, he is strident in his resistance, but that doesn’t mean he can’t repent. Bourgeois apparently knew very well he was excommunicating himself by participating in that ceremony, even before he was formally excommunicated.
Is the right way to go about that appealing to Francis to overrule Benedict?