You want to remediate the missing updates, yet when you go to the Remediate tab, the "Update Rollup" status is "Not Available."
This is normal behavior, and you can proceed with the remediation. The tag "not available" usually means that the update or patch was not downloaded to the repository yet. If you have chosen the option to download only needed patches, these will only be downloaded when you run a remediation job. Afterward, the patch will no longer be showing as "not available" since it would have been detected as being present in the patch repository.