I don't really understand the recall. As the quote below states, the problem can be solved via an update. I would wager a guess that the recall is to fix devices that people do not connect to Wifi/internet access (although this has to be a very tiny amount of purchases...who buys a Nest and doesn't connect it to the interwebs).

"According to the CPSC, the issue can be repaired with an automatic update when the device is connected to a wireless network and linked to a Nest account."

Further, they "fixed" this issue by disabling Nest Wave. Now you have to hit the button to disable an alarm, just like any existing smoke detector.