Midland63,
"check gear down and lock" words from tower is normal here at airports handling military traffic, and JOG, is an airbase... with a civilian enclave... At another airbase (with civilian ATC), it's "check gear down three greens" coming out for the milboys.
Magplug,
Garuda rushing an approach and not becoming stable is something which, though possible, seems unlikely, without other causes.
It seems morelikely that things were normal, then a flap malfunction, leaving them to land with little flap... The problem wasn't so much the lack of flap deployment, but the decision to land in JOG with that known flap (even 732s pilots wouldn't land their 732s in JOG with a flap15!), and also the differences between a normal approach and a flap15 approach added with the time of day/runway alignment.
A flap15 approach would give a nose higher than normal approach, it is extremely tempting to dip the nose down for a "better look", which would end up gaining a lot of speed thanks to the lower drag config, pull the nose up try to bleed off the speed, and repeat the whole thing again...
Add that with the sunglare, given that it was 7am and they were approaching into the sun. Furthermore, the threshold being above the surrounding terrain, with the runway above a bush-walled embankment with a river in front (no/little clearway before the runway), an upslope for the TDZ, but downhill until the end of the runway, can and has yielded visual illusions causing airplanes to come in high... Now in a flap15 config, that's not a good thing...
PK-KAR