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(a) …
(b) an address for service of notices,
(c) an Australian postal address, and an email address if the holder has one, if not provided as the address for service,
You will notice the “Australian … address” and the “if not” in (c).
If (b) is an Australian address then (c) doesn’t matter.
Take someone overseas and they give their OS address for (b), then they need to fulfill (c).
Meet (b) and then (c) doesn’t matter.
I will just rearrange (c) to make the above more visible.
(c) an Australian postal address if not provided as the address for service, and an email address if the holder has one.
If your address for service is not an Australian address then the Parliament would like the owner to provide an Aussie address and throw in an email if you have one.
If the Parliament, blanket, wanted an email address, if the owner has one, then the requirement would appear in (b), not as an extra in (c) just for those who haven’t given an Australian address for service.
You don’t need to apologies or retract because at the end of the day all we now have is competing interpretations.
I actually do not see why (c) means an owners has to give an email address unless they have failed (b).