[paranoidrobot]

It's complicated, but assuming that the ATO thought you were a resident for taxation purposes, then yes you still lodge a tax return in Australia, claim the tax paid in Switzerland as a credit (assuming it's recognised) and pay whatever gap there is.

It's made more difficult because tax years don't align, so it needs to be worked out that way too. Oh, and because Switzerland probably put their tax records in Swiss-Fench/Swiss-German all your documents would need to be formally translated.

I'd start by checking put the ATO site they had a bunch of tests for your residency there.