puff piece; flattering article; sycophantic article
A newspaper or magazine article that excessively praises someone or something, often to curry favor. The term derives from 提灯持ち (chōchin-mochi, 'lantern carrier'), implying someone who flatters or follows another.
See also: 提灯持ち
That newspaper writes nothing but puff pieces about the local politician.
This interview article is nothing more than a flattering piece.