This is not true. You can start to apply (seriously, but silly people apply sooner) after five years, but by ten years it becomes much easier. Prior to 10 years, you must show you've made a major contribution to Japan.
If the OP's bar is considered an important part of the community, he may actually have a good case. His livelihood is tied to Japan. He has invested in Japan (house, property, business). He employs Japanese citizens. His child has only known Japan as a home. As long as his finances are secure, and he is not in default, has no outstanding debt (besides those any normal Japanese citizen would incur for the same activities), and his employees, neighbors, and fellow business owners will speak on his behalf, I actually think he's got a shot to show he's contributed in several ways. Economically and culturally (by exposing his neighbors, employees, and customers Aussie culture).
Let me pull up relevant info...
Permission for Permanent Residence
You may not be successful the first time. Just keep reapplying every year until you succeed. Get your local politicians involved too, if they consider you a valued member of the community. Talk to your city council, your representatives, your prefectural Governor. If enough people, and enough documents, say THIS PERSON IS IMPORTANT, I think you have a good shot.