wilderness - 9:36 am on Feb 17, 2010 (gmt 0)
The 403 is a pretty strong hint that your IP address is banned. I'm sure that Google employees have access to tools that would allow them to quickly confirm what is going on.
403's may be served based upon a variety of conditions, even multiple conditions. For google or anybody else to assume that all denials of access are based upon IP's is a bit far-fetched.
Additionally google doesn't have a crystal ball which gives them a capability to read other servers configurations. Nor do google employee's have an Ouija board.