I was talking to a guy about this today on the phone who doesn't know a lot about running.
By discussing the hills we are confusing the issue. This Boston race was really about one thing- the 20mph tailwind at the runners' backs. That is the issue.
Obadele Thompson (now Marion Jones husband) ran a 9.69 when I was in college with a huge wind at his back. No one even bothered to consider it a world record.
For a while many people said "world best" instead of "world record" for the roads, and I think now "world record" is used. Whatever you call it, I don't think you'll find a track stats man who will call Boston the world record. World record" has an official meaning with various sports body and Boston clearly doesn't fit the definition. Boston was what it is, "the fastest marathon ever run."
No shame in calling it that.
Here's a good discussion on the wind's effect. The authors believe it made a 3-4 minute difference off of a normal Boston, some are saying 2+ minutes.