Why the French are so upset.

[Ninga]

10. AUS had many grievances with the French early on.

https://www.abc.net.au/news/2016-08-26/defence-urges-submarine-designs-be-kept-safe-after-india-leak/7787394

https://www.afr.com/companies/manufacturing/coalition-plans-nuclearpowered-submarine-fleet-over-long-term-20160429-goieal

Huge cost over runs
“At last count, the Barracudas were going to cost around 90 billion Australian dollars (€56 billion). And that's before the government factored in the cost of maintenance — which in November 2019, the department of defense told a Senate committee would set Canberra back a further 145 billion Australian dollars (€90.1 billion) over the life of the subs.”

https://www.smh.com.au/politics/federal/refit-of-ageing-submarine-fleet-should-have-been-locked-in-six-years-ago-labor-20210611-p58069.html

France defaulted

“By 2020, Naval Group had revised the 90 percent local input figure down to 60 percent. By 2021, the French firm was pushing back against even that, saying Australian industry wasn't up to scratch.”

https://www.malcolmturnbull.com.au/media/future-submarine-program

Lastly, AUS sub fleet due to age out by 2026 and France could not deliver their first sub until 2035.
Do the math.