No, he doesn't look half White, half Aborigine. He looks like an Indian, just a bit off, probably due to having some Englishman in his family. Kerala Indians are quite dark skinned, and scrawny. He definitely isn't a Yellowfella, a half White/half Aborigine. Maoris, I seen plenty in Australia, and in New Zealand, they are more like oversized and overfed SE Asians. They would make good Sumo wrestlers, the women (wahine) too.
I don't understand why inappropriate actors are used to portray certain ethnic groups or why Ashkenazi Jews often portray Italian Americans.