In general you won't find any traditional loin looms left of the Minang People in Minangkabau (Padang) on Sumatra in Indonesia. Most of the Minang changed to a significant Malaysian-type frame loom for commercial production. But it seems some few may have survuved.
Some ethnic groups on Sumatra keep going on using a traditional loin loom, while others changed to frame looms by the influence of Indian cotton weaving techniques coming in by Malaysia.
There are plenty of ethnic groups on Java Island in Indonesia using several types of loin looms for backstrap weaving, but mainly the typical Indonesian type of station loom, that seems to be invented on Java the first time.