As you have just demonstrated, the No campaign were campaigning on imagined legislation rather than constitutional change, which the referendum was actually about.
The referendum itself was about adding 3 sentences to the constitution, which basically acknowledged aboriginal people as the first people here and gives them a permanent voice to government. Not any power to make or reject any legislation, just forces the government to say "What do you reckon?"
However, the No campaign starting banging on about legislation, both federal and state (and even making claims about how Aboriginal people will now decide who gets parking tickets

). They then started banging on about demanding to know who the members will be, who picks them etc - that is all legislation to be decided by the govt of the day, but a lot of people were too stupid or ignorant to understand the difference.
Basically, the No campaign was just a fear campaign, championed by the leader of the opposition, summed up by their favourite catchphrase - "If you don't know, vote no". Not try and find out. Not here are some facts. Just - stay dumb and be scared