This network plugin only unpacks CNI plugins version cni_version into /opt/cni/bin and instructs implementation of container runtime cri to use cni.
It's intended usage is for custom CNI configuration, e.g. manual routing tables + bridge + loopback CNI plugin outside kubespray scope. Furthermore, it's used for non-kubespray supported CNI plugins which you can install afterward.
You are required to fill /etc/cni/net.d with valid CNI configuration after using kubespray.