Nah - I can't see that being true...?
For a start - it's easy to make your details private on a WHOIS lookup or to use a registrant code.
Then there's the fact that website's are changing hands every minute of every day - how would Google keep up?
It has been proved though that if you are going to build "micro" site's then you should use different hosting locations (with different IP ranges) rather than just whacking them on one hosting account with the same IP address.
Linking between your own website's is a very good stratedgy (better than just link building with any other site - James

) if done correctly - with good anchor text and unique content etc
