Things are done differently in AUS, if memory serves correctly a METAR in AUS is valid for 3 hours.
A METAR in Aus is just a report and has no validity period, it's simply a statement of conditions at a particular time. A TTF METAR on the other hand is a METAR with a trend attached, the trend is valid for three hours and supersedes the TAF.
The met report/forecast in the op is the equivalent of an Australian TTF METAR.