[bonoboTP]

Yes, with some caveats. Sometimes people can guess where a paper comes from based on the used datasets, even graphic design style, a skew in cited papers. Also, often people upload the preprint to Arxiv and so the reviewer may have seen the non-anonymous version already. Also, the having someone within the community among the authors will help with formulating the paper in a way that this community expects it. With the right turns of phrase, citing and praising those related works that are seen highly in the community, using the tone that is usual in the community etc. People should ideally try to counteract such biases in themselves, but humans are tribal and social. Especially if you scale this to tens of thousands of people, the average won't be a saint. People have careers, graduations, promotions, visas, green cards, job prospects, friendships and generally social standing in their professional community on the line. Academics aren't any more holy than people in finance, or politics or entertainment or startups or other ruthless and social-game heavy environments.