So interestingly, even though my battery shows a technical loss, my charge capacity is higher today than when Tesla first changed from the 93% to 90% slider about 2 years ago.
Before they switched, I consistently got 262 / 244 (range vs. 93%)
After they switched the UI, the very next day, my charge dropped to 257 / 230 (100% vs. 90%). I chalked the 100% value change up to a formula change. It remained this for the next 2 years.
Then over the last weekend, it jumped up, and I was able to charge to 258 / 231, and now have been getting it consistently ever since.
These values are so in the margin of error that between Tesla's frequent formula changes, balancing, and charge capacity calculation, the actual pack capacity loss itself gets drowned out.