No, Australia isn’t - Yilgarn, Pilbara, Gawler are all Australian cratons.
And I don’t even understand the distinction you’re trying to draw here. What continent isn’t made of a combo of cratons and boundary basin/mobile belts ?
The “Indo” in Indo-Australian Plate refers to the Indian Ocean. The Indian Subcontinent is , AFAIK, not part of that plate and shouldn’t be thought of as such IMO - different tectonic paths.