Yeah, I'm also wondering which era they refer to when they say 'again'?
The colonial pre 1945? Ah no, it was the Dutch East Indies back then.
The Soekarno period? Hmm, if they want to restore the political three pillar model with the communist party, and many girlfriends for the president of course.
The Suharto dictatorship? That’s a period where the country was sucked dry by nepotism from a certain clan and in which racism and violence against a certain ethnic group was stimulated by the state.
There are not a lot of options left besides those periods...
Majapahit?
https://en.wikipedia.org/wiki/Majapahit

