For a more educated answer:
Carbon/ceramic is very stable.
It's formed through carbonization by high pressure and sillicized by vacuum and heat (1400°C).
Most of its electrons are paired, making it less reactive and giving it few available electrons to form bonds with the hydrogen ions (H⁺) from...
Absolutely no problem.
But, be careful, they don't brake very well when wet/soapy.
Just brake a few times and you're good.
Other than that, no problem at all.
I've done this for more than five years already.
No, by charging cycles (and therefore milage).
Battery life is strongly influenced by heat and/or deposits on the boundary layers within the battery.
But it seems modern batteries are much better than expected so 100.000 miles is no problem at all.
You can use the search button on this forum.
It's pretty easy.
https://www.taycanforum.com/forum/threads/free-tcan-pro-taycan-battery-diagnosis-for-the-community.27701/post-415218
I can recall he was saying something about short-circuit in the thread Taycan lets you drive with shorted-out battery (part1 and/or part 2), that's why it's not initialized.
That's why I tagged him to tell what's going on, I could be wrong.
It's strange that your ∆V goes down (getting better) when SoC goes down, that should be the other way around.
Maybe a recalibration is needed.
Nothing to worry about though, your values are very good.
∆V is a bit of an estimate, 0,010 is excellent if all cells are 100% ok but that's hardly the case.
If you come close to 0,02-0,05 it's still good, but, again, it depends on the cells.
Isolation value Batt + ~10 KOhm
Other values around 2 KOhm.