The latest version of ReportBuilder supports segments created via this interface as long as they are compatible with SiteCatalyst version 15 data sets. If you are unable to access these global suite segments, please reach out to ClientCare to address the issue.
My apologies for the confusion. You can start another idea if you would like, but I will set the status of this idea to "Partially Implemented" to account for the lack of Global Report Suite Segments in Discover