Your copy of the CARs is out of date, megan.
Current CAA Act (with the definition of 'flight') here:
https://www.legislation.gov.au/Details/C2019C00320
Current CARs (with no definition of 'flight time') here:
https://www.legislation.gov.au/Details/F2020C00784
Current CASRs (Volume 1 of 5) here:
https://www.legislation.gov.au/Detai.../Html/Volume_1
Surely everyone's keeping up with every syllable of this stuff? It's about safety.