I’m unaware of that requirement as well. I’m president of our Kiwanis Golden K club and conduct monthly board meetings. We take attendance of officer and board attendance at the beginning of each meeting. Whether this fiscal year or in the past, I don’t recall a voting member ever leaving during a meeting. But had that happened, I’m confident it wouldn’t have made us recount members present. This is news of interest to me.
The default in Robert’s Rules is for votes to be either simple or super majority of ballots cast.
It is an anomaly from Robert’s Rules that the ELCA Constitutions require that votes to leave the denomination require a super majority of “members present”. If the “members present” phrase is not in the Kiwanis By-laws, nothing to worry about.