If a hotel is listed in the T&C/search then the discounts should apply. Note, you do not need to be staying at a property for the discount.
OG Description
asiapac.hilton.com
I observe some Australian Hotels appear available.
Here are the exclusions:
This Offer is not valid at outlets that are not owned or managed by the Hotels. The following Outlets are not participating in the Offer : (i) Outlets in French Polynesia, Maldives and Hampton hotels in China, (ii) Outlets managed by Hilton, including but not limited to all those at the following: Conrad Bali, DoubleTree by Hilton Alice Springs, DoubleTree by Hilton Esplanade Darwin, Hilton Darwin, Parmelia Hilton Perth, Hilton Garden Inn Darwin, DoubleTree by Hilton Noumea Ilot Maitre Resort, Hilton Queenstown Resort & Spa, DoubleTree by Hilton Queenstown, DoubleTree by Hilton Wellington, DoubleTree Resort by Hilton Hotel Fiji - Sonaisali Island, Hilton Cairns, Hilton Fiji Beach Resort & Spa, Hilton Guam Resort & Spa, Hilton Gyeongju, Hilton Yokohama, Hilton Noumea La Promenade Residences (iii) Outlets managed by third parties, including but not limited to the following: Rin Restaurant, Eight Degrees South – Conrad Bali; China Blue by Jereme Leung – Conrad Manila; Hanuman – Doubletree by Hilton Alice Springs; Chatterbox, Shisen Hanten – Hilton Singapore Orchard; Glass Brasserie– Hilton Sydney; Segafredo Zanetti Espresso – Hilton Tokyo Bay; The House Bar, Tenshin, Seoul Restaurant, Park90, Wine Menus managed and presented by Park90 - Conrad Singapore Orchard. Hilton reserves the right to add, modify, delete, or otherwise change any of the terms and conditions of the Offer (including the list of Outlets) at its sole discretion, with or without notice. Please check with the Outlets to determine whether they are participating in this Offer.