One thing these notes do make clear is that:

Equal access for people with a disability in this area is required by the DDA where it can reasonably be provided. This requirement applies to any individual or organisation developing a Worldwide Web page in Australia, or placing or maintaining a Web page on an Australian server.

It can’t get much clearer than that: all Australian websites must provide equal access unless there’s a really good reason why they shouldn’t. (Note that “equal access” does not mean the provision of an equivalent experience, but refers to access to content.)