You should contact Purism directly and ask them. How to properly send emails to Purism
(Most of the participants in this forum are not employees of Purism, do not speak on behalf of Purism, and as far as Purism-specific information goes have access only to the information that they have been able to pick up over time, which information they can direct you to.)
If you have not already ordered then I recommend that you do not order unless and until there is a clear statement regarding ordering for Australia.
I’m fairly sure that resolving that question is on the “to do” list for the Librem 5 but then I’m fairly sure that there are lots of other things on that list. 