nope, the domains are loaded upon page showing up: https://github.com/adietish/jbosstools-openshift/blob/72df870a10c7b5c8d8bcb97d4cd2536821ac8bd2/plugins/org.jboss.tools.openshift.express.ui/src/org/jboss/tools/openshift/express/internal/ui/wizard/application/ApplicationConfigurationWizardPage.java#L1069
The domains that we get then are cached. Thus no remote will happen any more. All checks are done on cached values.