Actually received this BRG approval back in early December. I looked today the rates were still same.
Grand Hyatt Singapore
Arrival Date: July 3, 2016
Departure Date: July 6, 2016
Occupancy: 2 adults
Room Type: Grand Twin Room
Third Party Site: getaroom.com
Third Party Rate: SGD $342 (refundable)
Hyatt.com Rate: SGD $440 Hyatt Daily Rate (refundable)
Approved adjusted rate: SGD $274.40
Decided to apply a Diamond Suite upgrade for this and was confirmed into a Grand Duplex Suite.