How's your memory, seems to me we had a certain Prime Minister by the name of Bob Hawke who was a dual citizen. Where did the matter get to at that time?
The real question is this farce of our High Court declaring Britain and even N.Z. a foreign power. The whole issue is a storm in a teacup to serve the elites program of downgrading our constitution and possibly to reprimand the present parliament for allowing this postal vote on "marriage equality".
It would be interesting to see if the high court thought China a foreign power given its growing land ownership in Oz.