Proxmox is generally run in a client-server arrangement where Proxmox and its VMs are on a server somewhere and users connect from a lightweight (probably browser) client. So the idea is that the device you use directly is a Chromebook acting as essentially a thin client, and then your real work happens in VMs on proxmox. Notably, those VMs can include Windows while containing it and not having to deal with Windows on hardware. (And I mean yes you could have a Chromebook thin client connecting to a server running a different instance of ChromeOS... and I can see ways for that to be useful, even... but that's not the idea being espoused here.)
