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I dont have a clue why you are posting a link to a paper written 4 years ago, but if you look into the supporting documentation as well as read his other papers, you will find that he is basically documenting how Google, AV and a few others have worked for years - its all about authority and hubs - and the more recips you have to good authorities, the better you end up with your sites.
You might want to look into some of the discussions that took place back in 2001 when most people discovered his work - thats when we figured out that Google might be looking at Class C addresses and whois info.
All of which has nothing whatsoever to do with the current filters Google is trying out and people are speculating about - we've seen these things come and go so many times - and they resolve themselves - the sky is not falling - and Google is a business - get over it
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