Hur man ansöker delen av webbplatsen citerad av OP visar hur man kunde använda "offline":
Lodge your application in person
If you hold an eligible citizen passport but cannot lodge your application online, you can apply:
- at your nearest office [of the Department] outside Australia
- with a travel agent, airline or specialist service provider.
European passport holders also have the option of applying online for an eVisitor visa (subclass 651), rather than an ETA.