If you want to remove all the APB's you could delete the ClusterServiceBroker that tells the service catalog to talk to the broker.

To update this field you could remove the white_list:

~~~~~
# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: v1
data:
  broker-config: "registry:\n  - type: rhcc\n    name: rh\n    url:  https://registry.redhat.io\n
    \   org:  \n    tag:  v3.11\n white_list: []\n\n    black_list: [.*automation-broker-apb$]\n\n
    ...
~~~~~


OR you could change the black_list:
broker-config: "registry:\n  - type: rhcc\n    name: rh\n    url:  https://registry.redhat.io\n
    \   org:  \n    tag:  v3.11\n white_list: []\n\n    black_list: [.*-apb$]\n\n

Changing status to VERIFIED since LGTM and no issue follow user guide.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:0636