This is a difference between the groups that explains the technological discrepancy. Both cultures were positioned to make the developments in question, but the indigenous Tasmanians gave up some tools and practices.

This deepens the mystery. Indigenous Tasmanians invented these technologies, yet they were absent from Tasmanian society 2,000 years later.

This explains the technological discrepancy. Polynesian explorers are responsible, because they introduced technologies to indigenous Australians but not to indigenous Tasmanians.

This contributes to an explanation of the technological discrepancy. Indigenous Australians developed these tools after the land bridge disappeared, so they were not introduced to indigenous Tasmanians.

This contributes to an explanation of the technological discrepancy. Indigenous Tasmanians were not introduced to the developers of these technologies before the land bridge disappeared.