No.
A legal letter is not a legal finding in a court. And there’s nothing to stop someone who has an AVO preventing them from communicating with another owner from being involved in a strata meeting (unless the court ordered them to stay a certain distance away from them).
If there was such a legally binding document, you could take the offending owner to NCAT to have them removed from office or from the committee on the grounds that they weren’t a fit and proper person.