When attempting to delete org/space group role bindings in Tanzu Hub, the checkboxes in front of the role bindings appear to be greyed out. This prevents the deletion.
Tanzu Hub
This occurs for system-generated, read-only role bindings in Tanzu Hub. That’s why the system does not allow you to manage the role bindings directly from Hub.
If any role bindings are created themselves from Tanzu HUB, they will be allowed for managing.