Indonesia has had issues with purchasing US weapons in the past. It is doubtful they would stop having other suppliers be it Russia or China. Just look at Egypt. Even with Uncle Sam giving them weapons essentially for free they got sick of always playing 2nd fiddle to Israel in terms of their air force and went back to buying Russian fighters.
I don't think the Bloomberg author even knows how much of Indonesian economy is dominated by ethnic Chinese. Whether it is 70+% or not, it doesn't matter much. It is more than high enough.
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There’s a popular myth that the Chinese controls 70% of the Indonesian economy. This figure is often disputed though.
“….. the myth - that the Chinese constitute only 3.5% of the population, but control 70% of Indonesia's economy - "has been repeated and repeated so often now by the world press, that everybody - including those sympathetic to the plight of Chinese Indonesians - seem to believe it."
A 1995 study entitled Overseas Chinese Business Networks in Asia claimed that Chinese-Indonesians controlled about 73% of Indonesia's listed companies "by market capitalization." Thus by end-1993, they reportedly controlled about 68% of the country's "top 300 conglomerates and nine of the top 10 private sector groups."
But unfortunately, those who came across the Backman study reportedly failed to note what the phrase 'market capitalization' meant, which, quoting from the same, amounted to "control by market capitalization has been determined after listed firms controlled by governments or foreigners are discounted."