What you haven’t mentioned is that each superannuation account is individualised. Each employee can decide the risk level of investments and can choose to contribute more from their paycheck (and get a tax deduction as well). They can then decide when to access superannuation and how much. Pretty much as far from a tax as can be imagined, but never mind that.
The other thing is that, because superannuation did not become a universal program until the 1980s, some people (like me) don’t have a 7 figure fund, but are able to draw a full or part pension.
Its future retirees who will have enough to fully fund their retirements, leading to massive government savings.