The model I have has an auto-update expiration in 2030, but that is a common criticism that they don't surface the AUE date when you're buying one. I checked here before purchasing: https://support.google.com/chrome/a/answer/6220366?hl=en

As part of the Lacros update Google is making, the OS can be updated separately from the browser so they'll continue to receive browser updates even after AUE.