Hi Nonoy,
The Austronesians originated on Taiwan, and then spread south into Indonesia. According to the archeologists and linguists, it's the origin of that group of people. There were people on Taiwan before the Austronesians, but they were the ancestors of the Austronesians, just as the Austronesians were the ancestors of many Indonesians, Polynesians, Micronesians, and a group in Madagascar.
Hope this helps,
F
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