No, your Plat status wil not help in that regard.

There appears to be a Special Event (Spring Racing Carnival) going on in Melbourne from Oct 30 through the night of Nov 7 and as such reward availability is limited/unavailable. There is award availability starting Nov 8 for all remaining nights in November. Paid rates also are $400 AUD during the Spring Racing Carnival special event period, and then drop to a more reasonable rate of $249-259 AUD starting Nov 8. Delay your arrival in Melbourne until Nov 8 and you have it made.