I don’t know what the Act says in NSW. I am in ACT where the Act is silent on proxy or absentee voting for EC meetings. However, it seems to me it would be very poor form for the remaining members of the EC to not count your view if the motions are notified and well understood by all. Since you are five, do you expect the matters to be split 3:2? If 4:1 or 5:0 are likely it won’t matter if your vote is not counted.