@Tim has already pointed out above that Hogan Island would likely be visible from Mt Oberon on Wilsons Promontory.
Rodondo Island would appear no closer to the islands that would be required to ‘island-hop’ to Tasmania than Wilsons Promontory itself, as well as being “ringed by steep cliffs up to 200 metres (660 ft) high” (making it little suited for landing in a canoe) – it is therefore irrelevant.
But as the vessels of the aboringines of SE Australia are “unsuitable for sea-travel”, all of this is irrelevant