Someone vibed the medal design
The more likely explanation is that the person manually googled all the landmarks of Sydney to get some vector images to cut and paste into a CAD program to extrude, and accidentally got the wrong one.
I say "wherever" because if they were paying attention to the licences of their sources they'd see the artwork was named for a landmark wasn't in Sydney.
Although I guess if the rights holder never knows about it, nobody is going to enforce the rights, probably hard to even prove it by the time its been shrunk and cast into metal.
My personal view is there is a minimum bar of effort and uniqueness before I actually consider it art and worthy of protection.
I realize that may not be the status quo but it is my personal view.