[gbcdoj]

What else could "membership" in the St. Michael the Archangel chapel refer to, other than those things that the Vatican expressly permitted?

Well, if you read the article posted here (as the thread starter) he argues that membership in this case means "formal adherence", in which case the excommunication is incurred only by those who also suffer the penalty of excommunication for schism according to "Ecclesia Dei".

I don't think someone who just attends Mass at the chapel could be considered to hold "membership" in it.

[bornacatholic]

You do a great job by posting the truth. Sadly, it doesn't matter. Kepp up your great work. My patience is at an end, for now. Nothing you can say can sway them.

God Bless