The issues with the non-AZ vaccines was that they didn't lock in early supply dates soon enough. For example, in June (which was already late for what was needed) Australia only had 1.7M Pfizer doses available[1] and now the PM is putting out press releases about obtaining extra supply from Poland[2].

Australia needed the doses in April/May, not September/October.

[1] https://www.abc.net.au/news/2021-07-09/australia-to-get-pfiz...

[2] https://www.health.gov.au/news/vaccine-operations-centre-wee...