Interesting.
So it seems like they are only concerned about the E400 batteries. When I had my 2016's battery "repaired" under warranty I was told they replaced the cells (or at least some of them) so I assumed that I didn't have the newer E400 battery at all. However, I did receive the recall letter earlier this year.
For the affected 2015-2017 MY SOUL EV vehicles manufactured from July 15, 2014 through June 30, 2017
that had their high-voltage battery replaced under warranty with an E400 battery,
So it seems like they are only concerned about the E400 batteries. When I had my 2016's battery "repaired" under warranty I was told they replaced the cells (or at least some of them) so I assumed that I didn't have the newer E400 battery at all. However, I did receive the recall letter earlier this year.