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.od the opposition who spearheaded the no can.paign 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.