What I'd like to know is if the support for this is still 5 years (I believe that's what's promised for Chromebooks), or more, and also if Google ends to use Ry

What I'd like to know is if the support for this is still 5 years (I believe that's what's promised for Chromebooks), or more, and also if Google ends to use Ryzen APUs in the future, too. Google with its architecture-agnostic OS has zero reasons to maintain Intel's monopoly for yet another platform.