It's not really too surprising that they can catch that trick. They keep a running tab of the Whois information and when it expires they reset the links. I'm not sure why it retained PageRank but actually that might disappear after their next update.
this foaf would still rate the experiment as somewhat interesting. the sites came with pagerank already and pointing anchor text at target pages did help the rankings. but that was in the pre-florida anchor text is king days.
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