Let's start with their beliefs: 1. Cloud computing is the future of all computing infrastructure.

Yeah, no. There's still gonna be things like mobile phones which will do some stuff locally. And probably also desktops. And probably also on-prem servers.

Which brings us to their belief no. 2: The computer that runs the cloud should be able to be purchased and not merely rented.

If you buy a computer and run virtualized loads on it, then you're not doing cloud computing. As simple as that.

Basically, as others have commented already, this is just something like a blade server system or a hyperconverged system like for example Nutanix is offering. The only real difference seems to be the open source approach.