It seems to be mostly written by university students
Damn, I wish I had the citations to back up what I'm going to assert, but when I left Indonesia I discarded a lot of things, including a wonderful book of Jakarta Post editorials and essays that went all the way back to at least the 1990s up to sometime in the 2000s.
Anyway, the book was a fine collection of democratic, humanistic thought, containing some pretty subversive commentary with regard to political structures in force at the time of writing. It was pretty amazing that they got away with some of their harsh criticisms of government hypocrisy, inaction, and indifference to the welfare of Indonesia's citizens. Sometimes they didn't pull punches, including on sensitive topics like religion and gender.
My guess is that the reason they were able to get away with it was because JakPo was in English. Had it been written in Indonesian, I'm sure jail sentences would have resulted for some of their writings.
Personally, I have a soft spot for JakPo, having known various people associated with it throughout the years. I also taught writing classes for them for a couple of years around 2015 or so, while Endy Bayuni was editor in chief, and the prime mover-and-shaker behind the idea of writing classes. Pak Endy is one of the most intelligent, thoughtful, kind people I've had the privilege of knowing.
(And yes, JakPo was often comically ridden with proofing/copyediting errors during my time in Indonesia. I believe I am on record at the old message board rolling my internet eyes at their mistakes. A pity they couldn't do better, but resources of both the human and financial kind were limited. They did the best they could.)