Details: The Assisted Installer documentation has several entries, stating that IBM Z (s390x) is not supported. RHOCPV went GA on IBM Z with RHOCP 4.19. The following spots need to be changed:

• OpenShift Virtualization is not compatible with the following CPU architectures: S390X, PPC64LE. https://docs.redhat.com/en/documentation/assisted_installer_for_openshift_container_platform/2025/html-single/installing_openshift_container_platform_with_the_assisted_installer/index#openshift-virtualization-operator_customizing-with-bundles-and-operators
• Currently, OpenShift Virtualization is not supported on IBM Z® and IBM Power®
  https://docs.redhat.com/en/documentation/assisted_installer_for_openshift_container_platform/2025/html-single/installing_openshift_container_platform_with_the_assisted_installer/index#installing-operators-api_installing-with-api
• This needs verification if it is still true:
  Currently, cluster-managed networking is not supported on IBM Z® and IBM Power®.
  https://docs.redhat.com/en/documentation/assisted_installer_for_openshift_container_platform/2025/html-single/installing_openshift_container_platform_with_the_assisted_installer/index#api_installing-cluster-managed-networking_installing-with-api