They went through LAX trouble free today so it officially works.
Global Entry had a new (to me) facial recognition system at LAX TBIT today whereby they completely eliminated the kiosks altogether. They are gone. Now there are just two lanes with a screen next to them and people walk up and get flashed, green screen "GO" or red screen see the officer. It was practically instantaneous and barely even required anyone to break their stride walking out of the airport. You literally just walk straight through and out the door. If it wasn’t for some people people stopping because they were obviously confused about the meaning of the green "GO" screen, I’m sure is could handle a person every few seconds non stop.
For the cards I figured, although citizenship is written on it, the main function of the card it just the RFID which is scanned if you use it crossing a land border. It should link to whatever is in their server and that is what the CBP Officer sees on his screen. If they required any further proof of citizenship or ID they would need to see a passport card or book, not the Global Entry Card. So we didn't bother updating the cards. But haven't tested that theory either.😁