I suggest you adjudicate the issue. Write up a summary of the argument which is covered very well above, and then provide it to the strata manager, and also tell them they should respond within 7 days with their counter argument (ie, specify those “privacy concerns” with reference to the law), and then both arguments can be submitted to Dept of Fair Trading, as a complaint about the manager’s conduct.
=> https://www.nsw.gov.au/housing-and-construction/strata/strata-complaints
I recommend other people with issues about strata managers do this as well. But I bet doing this will change the manager’s approach! Fair Trading are probably keen to discipline strata managers with all the publicity currently about rogue managers. They can only act on complaints, so make them! (Well, recent law changes means they can act without complaints, but they probably prefer actual complaints.)
But I understand the manager’s reluctance to provide the owner’s emails. If you do email to all the other owners, some of them will complain to the strata manager about their email address being made available. As well as strata managers being ignorant of the law (if that what it actually is), then so are the owners in the building, who assume their email and personal data is being kept confidential, like if they give that to a bank or solicitor. If owners then withdraw their email addresses, strata managers have to revert to regular mail for meeting and levy notices, which is a big impediment to how they run their businesses…