Now I’m confused too!
Your original post stated that an Executive Committee (E/C) meeting had been convened, that three (3) of the E/C Members including the Chair could attend, and that the two (2) remaining members being the Secretary and yourself could not attend.
Your last post (#10) reveals that your main concern is that the meeting will be hijacked by other Owners, but you’ve been advised (correctly) that these Owners have neither a vote on the item under discussion nor the right to speak unless invited to do so, and you’ve also been advised (again correctly) that in any case the item under discussion cannot be decided by the E/C.
The Strata Manager may have the role of Secretary delegated to them under the terms of their Agency Agreement with the Owners Corporation, but under the provisions of Sect 29(2) of the NSW Strata Schemes Management Act (SCMA) the Secretary can continue to exercise his/her functions, and under Sect 22(f) of the SCMA one of those (functions) is to convene meetings of the E/C and General Meetings of the O/C.
So as I get the feeling that you don’t want the Meeting to go ahead, and assuming that the E/C Secretary feels likewise, stopping the Meeting is best achieved by that person simply advising the Strata Manager in writing, with a copy to the Chair and other Members, that for a number of reasons, including that the item under discussion cannot be decided by the E/C, that they’re exercising their role under Sect 29(2) by instructing that Meeting is not to be held.
Note: Don’t provide the above instruction until a few days before the scheduled date for the E/C Meeting, as any two(2) E/C members can request the Secretary to convene another Meeting, and he/she then has only a little leeway in terms of time to prepare a new Agenda and to distribute that to Owners a minimum 72 hours before whatever Meeting date they’ve chosen and can attend.