Nintendo has taken to Twitter to confirm the achievement.
In a Tweet the first party said, “At launch, Super Mario Odyssey is the fastest-selling Super Mario game in Australia! Thank you for taking this amazing journey with us!”
Super Mario Odyssey launched exclusively on Nintendo Switch on Friday October 27, topping the platform’s chart and finishing in second spot overall behind Assassin’s Creed: Origins in the Week 43 IGEA Top Ten Charts.
— Nintendo AU NZ (@NintendoAUNZ) November 2, 2017