Doggie,
The standalone Flightwatch service provided on the frequencies nominated in the NOTAM (ERSA lists them as "FIS Flightwatch") will be not available across the entire country - that is; the *whole* lot of 'em.
The existing mechanisms of getting FIS from ATC on FIA VHF frequencies or HF is still available.
The ATC FIA frequencies are listed in ERSA FAC-B "Brisbane ACC/FIC" and FAC-M "Melbourne ACC/FIC" as either "ACC/FIA" or simply "FIA".