A presidential decree recently issued through the ministry of education prohibits Indonesian kids from registering to international schools in Indonesia. When in the past parents could apply for derogation this it seems is no longer accepted.
I think you're talking about UU 17/2010, a law passed in 2010, but not really much bothered with as no one seemed to be able to sort things out for ages.
Not really my field, but I understand the old national plus schools will become international schools, and international schools will be called, foreign or non Indonesian schools.
(I could be wrong here as the thing seems to be a rare old mess)
As I understand it, the national plus must have either 4 or 5 local teachers to every foreigner, and the international (foreign) schools can't have local students.
There was also something about serious restrictions on foreign teachers, I think I read something about them being allowed to teach English, but nothing else.
Last I heard, it was still up in the air, but that may have changed this year with the introduction of the new Indonesian national curriculum.
My daughter has a set of those books and I can assure you, they're absolute crap that wouldn't challenge a semi dead dog's brain.
Whoever wrote that utter rubbish must assume Indonesian kids are as thick as two short planks.
To the subject in hand, the naughty Indonesian pervert caretakers at JIS may well have added to this problem as the evil little toads seem to have either upset someone with power, or someone with an agenda has seen a chance to cause problems.
Sadly, it's mostly Indonesian kids that'll suffer from this stupidity but, as the OP suggests, other mixed race or foreign kids might well kop for a little brown stuff from the fan as well.
I've just been to my sister in law's school to deliver some bits and bobs to her, and the kids were crowding round, trying to learn a little extra English.
(that's a local Muslim boarding school)
As with Malaysia when they effectively dropped English, Indonesia will find itself with serious problems because of a lack of English speakers.
The slightly good news (from a selfish point of view), my kids will have a massive advantage in the job market as few Indonesian will be able to compete with them.