If that is true -- much of SEO rumors is total horseshit -- I am blocking many server farms from one of my major affiliate sites just to keep the parasites out.
If Google is using what I consider a *parasite host server data center* then they are getting a 403. If googlebot comes from its legitimate IPs using its proper user-agent sig -- then it has access and sees the exact same thing a human would.
Come in like a thief in the night -- I shoot first and ask questions later