Briggs said AIT is able to see where each of its advertising clicks are coming from, and in-house reports showing clicks from the same IP addresses indicate they are fraudulent.
One should have thought that a hosting company would be aware that most IP addresses are dynamic, and that it is very common for multiple users to share an IP address - like an office full of people accessing the web through a firewall, for example.
I suspect this article is more about publicity fo AIT than any wrong doing by Google.
Matt