The degradation information on apps like Tessie, Teslafi, etc is not very reliable. From what I understand it uses the BMS numbers to extrapolate what your capacity is. I think it was Out Of Spec Reviews, which mentions the accurate way is to drain it as close as possible to 0% then fully charge it to 100%, and note how many kWh it charged with. This is the same method that the Tesla Service Mode uses to verify battery health and it makes sense because the chemical state of the battery is what limits it. The Limiting Factor video explained very well how lithium-ion has both "calendar" aging and "use" aging affecting it.