As others have stated, we explicitly don’t have free speech in Australia.
We also don’t have any laws requiring political campaigns to be truthful. And as we saw, the day after the vote was done. All the leaders of the “No” campaign flat out abandoned indigenous people and explicitly said they wouldn’t be fronting a new referendum for recognition in the constitution without the voice. A promise they made repeatedly.
The leader of the opposition who spearheaded the no campaign has been called a fascist by his peers. And once commented that if elected he would do away with parliament and elections if he could.
Sounds like ARMA, walk for an hour and get shot from God knows where. Just like real life!