There are two ways of reading that 8 year battery warranty claim Scott.
First is, as you say, no ICE has a warranty that long as standard, so the batteries must therefore be better than ICEs right?
The second is that Tesla knows full well that the batteries will be toast at 9 years! Most modern ICEs just don't fail and will last MUCH longer than that.
Perhaps even worse, I think Tesla are also being sharp here in knowing that very, very few Tesla owners will keep their car for 8 years or more. Perhaps paying to replace the handful that do is deemed cheap vs the PR benefits of the claim?
I’m certainly no battery boffin, but if I look at the batteries in all the various products in my life, they are certainly the weak link regarding longevity of the product. I think that’s why people are suspicious.
But fear not with the Livewire, if the HD battery goes just buy a bigger and better S&S version !