The debuginfo packages are not hosted on mirror.centos.org ( to save mirror space ) - they are hosted at http://vault.centos.org/debuginfo/
Not available as YUM repository? :)
People, usually, only need debuginfo for specific package-version-release, so its easy to lookup and download directly.
Yes of course. But it would be even easier with additional repository. But I will survive either way. :)
Mindaugas