I agree that if you were a specialist consultant and found an exploitable niche, you could pull USD$200k equivalent here.
OTOH this salary doesn’t go far in terms of lifestyle in Sydney. It is expensive, it’s probably enough to live off but I’m not sticking half my salary into the stock market like you American developer like to do.
200k US in Sydney means either get great at kernel level code or multithreaded c++ and help the poker players make more money from the stock market. Or forget technical and become a senior scrum master or project manager for CBA. I think rural doctors and phsyciatrists rake it in, and geologists during the next mining boom. Install air conditioning is another way or any kind of trade where the labour component can be marked up extortionately and where some “tax planning” can be utilised.