The timing of the Safari to Ubud makes sense with the first flight of the day from YOG to Bali
GA 250 Flight Information
Route: From (JOG) Yogyakarta, ID to (DPS) Denpasar Bali, ID
Duration: 1h 15m
Departure Status Details
Airport: (JOG) Adisutjipto Airport
City: Yogyakarta, ID
Scheduled: 8:00 AM - Fri 24-Jun-2011
Arrival Status Details
Airport: (DPS) Ngurah Rai Airport
City: Denpasar Bali, ID
Scheduled: 10:15 AM - Fri 24-Jun-2011
That tweet seems to be timed close to the landing.