Very interesting video, thanks. Also appreciate you set the video to start at most relevant point.
One more thing to mention is that EV BMS have a strange tendency to "restore" SoH on repeated rapid charging. I have noticed SoH going up as battery is exercised by rapid charging.
Similarly, as mentioned, the mostly AC charged could have been kept near 100% most of the time. I know the option to limit charging to 80% was removed around 2016 when infotainment screen was refreshed from CarWings to Nissan Connect.
Finally, this SoH read out is as accurate as BMS's best guess, If the car never exercises its full battery capacity (eg always AC charged small amount), the BMS figure would be lower than actual.
Case in point, this is a snippet of my MYLR battery health plot against mileage. The wavy lines show SoH is more of a guess than actual value. The highest points are when I did the 1560 miles road trip to Isle of Skye, exercising the battery from high 90% down to low 10% and doing many ultra rapid charging.
I'm not at all worried about recent rapid decline, as I've been charging small amounts last few months. Battery capacity calibration is slowly going off. Could come back if I exercise the battery and do one charge to 100%.