I doubt Pelosi or Newt did that either. But your premise--that to figure out what the Taiwanese want means you would look at the aborigines of Taiwan is just silly.
I also typically don't buy arguments about "historical rights" or who conquered what hundreds or thousands of years ago. (Those arguments sound a lot like Putin defending his invasion of Ukraine, don't they? Hitler's invasion of Sudentenland? I don't think that's a coincidence.) In my opinion, a person alive today does not have a right to conquer another person because he can find a first-in-time ancestor that lived there. I reject that justification wholesale.
There are 24 million people living on that island who don't want to live under Chinese rule. I know a few, who lived here and were friends and then they moved back. They are happy anytime the US supports Taiwan. If the Taiwanese don't want to poke China with this visit, Pelosi should honor that.
Note, I don't think that if they want her to visit, that means she should necessarily go. The U.S. should analyze this based on the host of other strategic factors you mention, as well. But I hope one of the factors we always consider is the U.S. interest in promoting the freedom of the 24 million Taiwanese people.
Sure, ignoring the rightful owner of any lands of any aborigines works for your narrative. Maybe not so for the Aborigines. Don't they see it as conquering colonials -- whether in Australia, USA to Taiwan? It's silly from your perspective since its been hundreds of years ago and the conquerors basically decimated the native populations with the justification that they brought economic development to the lands. That's exactly what the Afrikaners said about owning South Africa and the enslavement of the native blacks.
Like I said earlier, time seems to be the solution to washing off the sins of the past -- and not restitution or acknowledgement -- like some self-imposed statute of limitation.
But I digress.
The Chinese have been on the island of Taiwan since the 1300s. Not this 'rebel' government but under the rule of the prevailing governments of Beijing.
Beijing did not invade HK and Macau to get back what they perceive to be their lands. So I don't see them invading Taiwan either.
As far as they see it, it's a domestic situation. So why provoke the situation?
What does the US Congress/Gov't gain by visiting?
Some symbol of freedom? Give me a break -- it lost the moral high ground when they left the women and children in Afghanistan to be abused again under the Taliban a year ago. (That's a HUGE black stain in my books.)
And so you seriously think the US is willing to lose American blood in the protection or in a more politically palatable/jingoistic term: the fight for the freedom of the Taiwanese people?
There is zero chance of that happening especially after walking out on the women & children of Afghanistan.
So why provide false promises and hopes and fool the Taiwanese government into emboldening of their stance?
There are zero purposes for the visit other than for one's own political expediency.
Btw. the different Taiwanese governments have varying stances toward China too. Some are more pro-unification than others.