At the install section, the subscription is called "hco-operatorhub".
And at the uninstall, the command for deleting the subscription is:

oc delete subscription kubevirt-hyperconverged -n openshift-cnv

They name better be consistent

v4.19 and lower

1.
2.
3.

Uninstall command:

 oc delete subscription kubevirt-hyperconverged -n openshift-cnv

 oc delete subscription hco-operatorhub -n openshift-cnv

Install sub name:
https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/virtualization/installing#installing-virt


Uninstall command at the doc - https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/virtualization/installing#installing-virt:~:text=Delete%20the%20OpenShift%20Virtualization%20Operator%20subscription%3A