As an Indigenous person whose first language is Ojibwe/Cree ... you have no idea how fast Indigenous languages are disappearing. My parents spoke only our language but they knew a little bit of English to work with the non-Native world. My grandparents spoke no English at all. I am fluent in both languages.
Starting at about the 1990s, my family became 50/50 Ojibway and English. Ten years later it became 80 percent English, 20 percent Ojibway. By the 2010s, it was about 90 percent English 10 percent Ojibway ... I don't have kids of my own but I have about 40 nieces and nephews (yes I have a big family) and several of them also have children - and almost all of them exclusively only speak English with limited Ojibway.
I'm happy they at least know the language but it isn't their main language any more.
The fact that these people in Tasmania resurrected their language is a miracle ... I am absolutely truly happy for them.