Or Google could just provide long term software updates for their hardware like Apple does. Just because the browser portions continue to be updated sounds like the other portions won’t be.
It would be really great for google to extend support and make the browser updateable later - the browser must be the vast majority of attacks. I think they have to keep old hardware around and they want to use more power, it's hard to keep things working on weaker, older systems.
My guess is google doesn't add chrome-only updates to existing end-of-lifed units, it will only be for new ones. But I hope I'm wrong.