Its fine Panzermann, my link directs to a subscription request. But that still leaves Corinthian being faster than you
France has some level of security relation with Australia as well actually. Australia and France have a history of working together in disaster relief. There are French territories in the Asia Pacific, most notably, New Caledonia, so France does have a little interest in the region as well.
Many Japanese netizens have expressed concerns about leaks to China, so many are actually quite relieved about the news. Some saying France was best anyway, etc. Darwin port being leased to China is an example of the basis of fears of leaks. Looking at Australian news, job creation for the submarine construction sector played a big role. Leaves me to think that is was even more important than actual capabilities of the sub. Although that is not to say that their new sub with France won't be good.
And yes, China would have been angry about it. Goes to show how important it has become to not upset the feelings of the Chinese people™ these days. Between additional stress from China, stress in ensuring smooth work conditions for Australian workers and within budget, and anxiety about leaks to China from the Japanese side, the selection of the Japanese sub would have put unwelcome strain on the forming Japan-Australia security relationship. If it was military equipment that was less sensitive, like tanks, I think Japan would be feeling more disappointed, but the subs require special security protection. And at already 50 billion, it might be hard to ensure top level security throughout, in and out.
About the graph, the Japanese proposal to Australia was an Australian version of the Soryu MK II which would have a hull longer by a few meters to include additional space for extending range. Other features like Tomahawks might have been included.