I sent them a note and did not massage them but here is their response:
Dear Mr. Djjaguar
Thank you for your massage to us,
First and foremost I would like to thank you your continued loyalty and patronage of Hilton as valued Hilton Honors Diamond Member and for choosing Conrad Bali for your upcoming visit to Bali.
As our loyal Diamond Member you will be entitled with complimentary room upgrade to the next room category up to Resort Suite, however this room upgrade will be subject to our room availability upon arrival. Our receptionist team will review the room availability for you upon arrival and give the room upgrade which is available at the time of check in. You may booked start from deluxe garden category, however the room upgrade will still subject to our availability. Should you wish to secure the room before your arrival, we suggest you to book the suite room that you desired.
We have two different suite category, the first one is our suite room at the resort area and the second is our premium room Conrad Suite at the Conrad suite building. The room upgrade that entitle for our diamond guest will be up to our Resort ocean suite room at the resort area. Meanwhile, should you book our Conrad suite room our Conrad suites is located in separated compound and secluded building away from the main resort.
We hope above information suit you well,
Please do not hesitate to let us know should you need further assistance,
Thank you
Best Regards,