That's incorrect. All current and recent-ish Chromebooks get at least eight years from date of release. And with the move to separate Chrome (the browser) from the OS, it will be possible to update the browser even after system upgrades are finished.

Google uses the term AUE (automatic update expiration) for the end of service. They provide a list of AUE dates here:

https://support.google.com/chrome/a/answer/6220366?hl=en#zip...

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.

Hopefully not, because that's incorrect. AUE dates for AFAIK all currently sold Chromebooks are 8 years from release.

It's 8 years and even then you'll still be be able to enable updates for Google chrome