Does GMAC reveal the identity of an examinee to the readers of the examinee's AWA responses?

"Readers are trained to be sensitive and fair in evaluating the responses of nonnative speakers of English." - Page 760, The Official Guide for GMAT® Review, 12th Edition

Does this imply that the nationality of a test-taker is revealed to the readers who evaluate a test-taker's responses in the AWA section (of the GMAT)? If yes, is this disclosure leading to the readers awarding ingenuine scores to nonnative speakers of English?