All I can find is that the costs followed inflation as expected. And, yeah there were some delays but getting full sovereignty over the construction of your military submarines (because that was the end goal there, the transfer of technologies, including state of the art, silent non-nuclear propulsion, so Australia could ultimately build their own subs “with total sovereignty”, according to the deal). I see zero mention of the terms of the contract changing after its signing apart from that.

And if you think that’s bad I’ve got some news for you about the delays and costs of that AUKUS thing…