Came here to make roughly this same assertion. As soon as I started reading about 'art' I was like well... the only reason google would pop it and not say anything is because it contained pedophilia material/underage 'art' and they probably wont be able to make an official statement until a police investigation results in either the material being released/oked or the guy getting charged.

Or the alternative, google didn't want to continue hosting the questionable content since it resides on their servers.