I haven't seen any articles discuss a major issue: his immigration status. If he's on a visitor/business visa he likely only has 6-12 months in the country. If he's there as a tourist, 90 days. If he overstays his visa, he can be arrested and deported.
My guess is he expected non-medical sponsored visa as a person of special interest to Australia. And as a 9 time winner, he had every right to at least hope for such case. If political circumstances in Australia were different, and/or if he was less vocal, he just might got it.
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