Many of the aboriginal tribes were matriarchal or at the very least gave women the same amount of power as the men. If Chinese men married into aboriginal communities, the culture would be better preserved. However, the majority of the earliest Chinese settlers were brought over by the Dutch as laborers and were predominately male. As the tribes also practiced exogamy, many of the Chinese men married aboriginal women. Since the Chinese lived near the Dutch forts in their own communities, their children grew up isolated from their mothers' cultures and became more Chinese.
In this timeline, because the local aboriginal population is larger and more peaceful than OTL, there is no need for the Dutch to bring over people from China. There will be some immigration from the mainland further on (as well as more immigration from Japan), but nowhere near the scale of OTL since the lowland regions are already fairly densely settled by aborigines.
Will the dutch retain Taiwan?