i suspect (does not seem to be part of the rules), it is only for flights with an AY codeshare number.
You can easily find out on the finnair website itself, codeshare flights have the Finnair tail, and those OW operated flights are with the OW symbol.

I went through most of the main cities in OZ, and seems SYD is the only one codeshared by AY, not even MEL.

Cheers!