It depends on context. There are the original prior to Dutch trade natives (naruan, whatever) and the colonists from the mainland that came in waves over time who are now native in relation to post WWII immigrants from the mainland after Mao defeated the nationalists on the mainland.

It’s not too different from someone who is a German native but isn’t caucasian, for example.

The various Austronesian tribes in the Urheimat, yes.

Still, the distinction between Japan occupation-experiencing Han population and the evacuated Mainlander Han is an important one.

Isn’t that the problem? The Japanese treated Taiwan as a first class province, while Chiang Kai Shek was much more authoritarian with his take over of the island (killing off a lot of the island leaders and educated people to prevent dissent). This has led to a much closer relationship between Taiwan and Japan, and a harsher relationship with the mainland.

Technically ya, but in modern usage it refers to a previous wave of immigration to Taiwan from Fujian.

Taiwanese aborigines are firmly in the KMT/mainlander camp.