Please post questions as a new topic, even it they are similar to an existing topic.
I think Joe should attend, vote, and make motions. The chair will rule, sua sponte, that Joe has no such rights. He can appeal and make his case.
But first, he needs to contact other members, explain the situation, and get people on his side. He should line people up in roles, even having someone else who will appeal if his appeal is not recognized. Optimally, they should game it out and practice.