It will provide precision approaches to every airport in Australia if they build enough ground stations. Basically the ground station acts as a satellite. As the poster suggested that's better then ADSB on the whole.
No he didn't, he said a SBAS has "far more safety benefits" than ADS-B. So we have to pay for ground stations (and the WAAS satellites ?) for something we may use once in a blue moon (given we have LNAV approaches to 500ft AGL now, and the big end of town have RNP-AR). Nice to have, but give me ADS-B any time.