I have owned a strata property in NSW for 30 years. At every AGM we get a list of the financial status of ALL lots. For each lot we get owners name(s), levy amounts, payment amount and balance. So, I would suggest that no privacy laws apply. In any case, if someone is in arrears the other owners have to decide what to do recover payments (i.e. more reminder letters, legal recovery, etc) so would need to know who is in arrears and by how much.