I read about it on the ABC yesterday and they're usually quite reliable.Here are the places I saw it:
https://www.reuters.com/world/asia-pacific/first-tasmanian-devils-born-wild-australia-mainland-3000-years-2021-05-26/#:~:text=First Tasmanian Devils born in the wild of Australia mainland in 3,000 years,-Reuters&text=Tasmanian Devils have been born,sustain a new breeding population.
https://wildark.org/journals/tasmanian-devils-return-to-mainland-australia-for-first-time-in-3000-years/#:~:text=Aussie Ark's Tasmanian devil breeding,endangered species on mainland Australia.&text=Today, it's home to more,population spread across mainland Australia.