IMHO that sentence doesn't prove your point that "The link also says they wouldn't export EU manufactured vaccines".

AZ is selling at cost, so they are not making a profit from the vaccine atm. So that statement should be trivially true.

If they are actually selling at cost [citation needed], why would they ship to Australia with undoubtedly higher transport costs?

It is well known that AZ sells the vaccine at cost. E.g. "... is being offered by the drugmaker at cost during the pandemic and at no profit in perpetuity for low-income countries." [1] That's because the vaccine was developed by the Oxford university and Oxford made this a condition. If AZ makes a profit from the vaccine during the pandemic they would break the contract with Oxford.

It seems the cost price differs from country to country because of different production costs and other factors (maybe shipping).

[1] https://www.politico.eu/article/astrazeneca-vaccine-cost-hig...

This still doesn't provide an explanation for shipments to Australia, other than for higher profits. Which he explicitly denied doing so.