The New Yorker is an upper-middle class publication. That is its target audience. Other magazines owned by the same media conglomerate, Conde Nast, are broadly similar in orientation: Vogue, Bon Appetit, Vanity Fair, GQ, Architectural Digest. I don't think they 'advocate for the lower classes', subjectively or objectively. I read very few socialists and communists in the New Yorker!