Since I started the thread, I should update it...
Got an updated recall letter in the mail earlier this summer (early June?) with the "parts not available, we will notify you later" line from the first official letter in March removed.
Got the first software update in forever on 20Jul.
Got the "center screen capability degraded, please schedule service" message on 22Jul.
Scheduled service for eMMC for 07Aug with notes on receiving the message.
Arrived for service, advisor's first question was "when did you get the error, if we cannot find it in the logs, we cannot perform the service."
TL;DR - Waited until I had received both a) the updated recall letter saying parts were available, and b) the degraded capability message in the car before scheduling the eMMC recall, but apparently service centers are still requiring verification via vehicle logs before they will perform the work.
Got an updated recall letter in the mail earlier this summer (early June?) with the "parts not available, we will notify you later" line from the first official letter in March removed.
Got the first software update in forever on 20Jul.
Got the "center screen capability degraded, please schedule service" message on 22Jul.
Scheduled service for eMMC for 07Aug with notes on receiving the message.
Arrived for service, advisor's first question was "when did you get the error, if we cannot find it in the logs, we cannot perform the service."
TL;DR - Waited until I had received both a) the updated recall letter saying parts were available, and b) the degraded capability message in the car before scheduling the eMMC recall, but apparently service centers are still requiring verification via vehicle logs before they will perform the work.