Examples from the Web for puff piece
At one point the original film is referred to as a "puff-piece."‘The Armstrong Lie,’ Alex Gibney’s Portrait of Lance as a Liar|Thomas Flynn|November 9, 2013|DAILY BEAST
British Dictionary definitions for puff piece
Idioms and Phrases with puff piece
An approving or flattering article, as in That was really a puff piece about the conductor, written by her cousin. The use of puff for “exaggerated praise” dates from about 1600; piece was added in the mid-1900s.