IIRC, they actually are Chinese, but the MSM does their best to misdirect (lie) to give them some cover. Taiwan was just a stop along the way.
That’s right.
Shanghainese.
Very close to Jiang Zemin.
There can be little doubt the CCP consider the entire family citizens.
As for your later points, it has been obvious from the beginning that security camera tapes and blood chemistry analysis would be extremely important.
If there is a tape of her entering the water, as it is suggested, then there might be one showing she was mobile enough to enter the car on her own and not "helped". Blood chemistry will likely reveal whether she was under the influence of any disabling substance. An "autopsy" of the Tesla would also seem indicated in order to reveal any hacking.