There are 2 different warranties, the older one pre October 2023 (I think) which is the 10 year warranty with a sliding scale of compensation, and then a slightly different warranty (12 years) that requires the system health check etc etc. I’m on the 10 year original warranty, as will your 8.2 and possibly the older Gen 2 9.5.
I’m sure the original was also 70% at 10 years? Though I also think all large battery systems, givenergy, cars etc offer the same 70% after x years or x miles. Would be worth raising a support ticket for regardless.