This is what you call official records? Try & use it as concrete prima facia evidence in a court of law & see how far you get. If the article as it says it is, then why not just release the official records as Bush & McCain did?
There is nothing "official" about private university records. If you want to know whether someone matriculated at a given college, all you have to go on is the word of the administration. Transcripts, diplomas, etc. are just the word of the administration put down on paper. That's why the testimony of an administrator would be perfectly acceptable evidence in court that a given person attended a college.
Administrators from Columbia and Occidental have both said Obama was a matriculated student there, and Columbia has confirmed he recieved a degree. That would be good enough in any court, unless you have some evidence to the contrary.