No, the European press stated that it was around that number, so no propaganda.
If this was really such a great thing for them, they would vote 90+% in favor and the battle would have been to get the rest of the country over 50%.
For example, New Caledonia voted 96% to remain part of France. That’s much better as referenda between an ex-colonial power and indigenous populations go.
Seems to me like some better solution must be found that can find a majority support among all Australians and a level of unanimity among indigenous Australians.