Tasmanian Aborigines? Well, I'm not sure how the French would have treated the natives ITTL. The Franco-Native relations in New France were rather cordial, but then again New France barely saw any settlement (the only area of significant settlement being the St. Lawrence valley from Quebec City to Montreal, in total only 8,000 to 12,000 Frenchmen ever moved to New France), and obviously this isn't the case with Antipodea. Also, the influence of Social Darwinism and Scientific Racism would probably lead to at least some sectors of Antipodean society treating the Aborigines terribly (just look at the Belgian Congo, although it couldn't really get worse than that). I don't know if it'd be abducting children and shipping them to boarding schools (the U.S., Canada and OTL Australia all did that), but it wouldn't be "live and let live", especially from the colonists more so than the government back in Paris.