Surely the message here is not in the details of the contract or the specific tech transfers, rather it is that the US is actively disseminating nuclear technology in Australia/Asia.
China has done zip to halt the North Korean nuclear effort, so the US will help its friends to arm up correspondingly. South Korea, India, Japan and Taiwan are on the agenda, imho in that order.
China will be deterred militarily, that is relatively easy. The commercial dependencies will be a lot more difficult to deal with.