Ummmm, no, they aren’t. Australia only just recently stopped letting people in. They have had YEARS of mass Mooslim immigration from Indoneisa.
Whilst many asylum seekers reach Australia via Indonesia most of them are not Indonesians themselves.
There is a big Muslim community in Australia but few of them are Indonesian, most of them are Lebanese or from other areas in the Middle East. The small community of Indonesians in Australia are mostly made up of Indonesian-Chinese or Indonesians married to Australians and are fully assimilated into Australian life.
There’s no need to blame the Indonesians for this, I can guarantee you that when the perps are identified they will not be Indonesians or in any way associated with Indonesia.