I disagree that nothing has changed. I use the Radar frequently and often zoom between 64,128,256km range. These options disappeared some time last week, and now State level is the only option under Zoom.
I'm located Canberra, so it's not just a Sydney thing.
I'm using Weatherzone+ on IOS (iPad and iPhone), and got someone else to check on their iPhone - same thing, so it's not account related.
There have been no updates to the App installed in the last month, so it must be a server side change.