It's a lot more than that. Clustering, storage drivers, networking, etc makes up a whole virtual machine manager. It never says it's a hypervisor, it's a VMM as

It's a lot more than that. Clustering, storage drivers, networking, etc makes up a whole virtual machine manager. It never says it's a hypervisor, it's a VMM as outlined on it's github: "Powerful system container and virtual machine manager"