Emphasis mine:
Actually what is says is
In Australia, The Things Network uses both the LoRaWAN AU915 band plan and (more recently) the AS923 bandplan. See https://www.thethingsnetwork.org/docs/lorawan/frequency-plans.html. Your region can use either one of these (or both).
For AU915, we use Frequency Sub Band 2, also known as channels 8-15, or 916.8MHz through to 918.2MHz.
For AS923, use AS920-923, aka AS1 aka 922.0 - 923.4MHz.
And further down:
In Australia, we use the 915-928 MHz frequency range with a maximum Equivelant Radiated Isotropic Power (EIRP) of 1 watt. In general, if you use AU915 or AS923 compliant LoRaWAN modules, you will be complying with the standard.
Note that US modules cannot be used in Australia. Although the US also uses 915 MHz, the actual band is wider than ours (902-928 MHz) and it is illegal to use the lower part of the band in Australia.
You have the option to use either of these and I beleive the RAK7244 can support either band.
There is a scism if the use of the bands in Au, in part driven by history, early roll-outs and availability of gw/nodes & modules etc. so which band is best may depend on where you are located and the propensity for one band over the other. perhaps @Maj can advise based on your specific location and others in the comunity can then help you get your GW online 