It might be.
I was in that position many years ago, with my now "ex" wife.
I used the "being married to an Australian Citizen, and having an Australian child, as my significant ties to Australia"
They then interviewed us both, before getting the RRV. I had spent the previous 5 years out of total 15 years PR, outside Australia. My RRV had expired for 2 years, while I was away.