Is checking kube-system namespace a proper way to check that the recovery API server is ready?

Issue

In Recovering from expired control plane certificates, in step 6, there is a loop to wait for the recovery API server to come up.

# until oc get namespace kube-system 2>/dev/null 1>&2; do echo 'Waiting for recovery apiserver to come up.'; sleep 1; done

This step looks redundant, because kube-system was present in OCP cluster.
Why there is no recommendation to check recovery-apiserver directly, using crictl for example?