I don't really understand. If Gold didn't have use cases as jewellery or for industrial uses then are you saying it would be a net destructor too? How can it be

I don't really understand. If Gold didn't have use cases as jewellery or for industrial uses then are you saying it would be a net destructor too? How can it be a net destructor if the coins are worth more than the mining energy? Would Gold become a net destructor if jewellery demand declined for some reason?