I think that was an extremely small rollout. I didn't even know they ever deployed it until I checked when I read your comment. The upgrade path is full fibre, which you can now finally get in alot of places.

Has G.fast been deployed in significant numbers in Australia? I thought it was a few thousands subscribers only.

CenturyLink/Lumen has been using G.fast for most new FTTH deployments since 2016. They still install fiber to the outside of the house though, it's mostly about avoiding needing the installer to mess with wiring in the walls of existing houses, and being able to reverse power the outside node, instead of needing an outlet outside.

I'm pretty sure G.Fast was never actually deployed for NBN FTTC. It was planned/announced in 2021-2022, but eventually NBN came about their senses and decided to do FTTC -> FTTP upgrades like they're doing for FTTN.