All this is true but old habits die hard.You said "If it look like anything in China" Yup that is the problem. High tech transportation require more than building it. It also maintenance intensive and require commitment in money and due diligence to ensure it will operate safely. But the track record of Indonesian airline is not very convincing witness the many accident in Lion air etc.
China providing high tech transport is double edge sword. I guess in 2000's China sell MA 600 to Indonesia .And the trade minister at that time is Marie Pangestu a Chinese descent. She just happened to be there when the transaction was sealed But she was accused of giving preference to Chinese airplane . See the murky politic in Indonesia and the blame game. Saying she bought a crappy airplane from China. When actually it is due to pilot error
Mari pengestu bio. She is now managing director of World bank a Davis graduate and a Nyonya
The same with Chinese governor of Jakarta A Hok who was accused because of many busses by Yuetong suddenly burst into fire
So I will with held the assumption the Jkt - Bdg railway will win China applause
IMO, China will need at least a decade to start waning off its low quality goods reputation .