The DeleteImageSetConfiguration file example provided in the below doc should include defaultChannel option for operators.

https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/disconnected_environments/mirroring-in-disconnected-environments#oc-mirror-workflows-delete-v2_about-installing-oc-mirror-v2

The file should look like below:

apiVersion: mirror.openshift.io/v2alpha1
kind: DeleteImageSetConfiguration
delete:
  platform:
    channels:
      - name: stable-4.13
        minVersion: 4.13.3
        maxVersion: 4.13.3
  operators:
    - catalog: registry.redhat.io/redhat/redhat-operator-index:v4.12
      packages:
      - name: aws-load-balancer-operator
        defaultChannel: stable-v0.1
        Channels:
          name: stable-v0.1
          minVersion: 0.0.1
          maxVersion: 0.0.1
  additionalImages:
    - name: registry.redhat.io/ubi8/ubi@sha256:bce7e9f69fb7d4533447232478fd825811c760288f87a35699f9c8f030f2c1a6
    - name: registry.redhat.io/ubi8/ubi-minimal@sha256:8bedbe742f140108897fb3532068e8316900d9814f399d676ac78b46e740e34eShow

A note should be added to inform customers that the defaultChannel option is needed to be used in the DeleteImageSetConfiguration file if the images being deleted are not from the default channel.

4.19