It is uncertain whether Australasian kangaroos are genuine leather. Australasian kangaroo is an animal, and dermis usually refers to animal skin, so the concepts of the two are not exactly the same.
In addition, the fur of Australasian kangaroo is a part of its body, but it doesn't mean it is genuine leather. Therefore, if you want to know more about kangaroos in Oceania, I suggest you consult related books or consult professionals.