In what way is Kurt Vonnegut's short story "Report on the Barnhouse Effect" an example postmodernism

Kurt Vonnegut's short story "Report on the Barnhouse Effect'' is an example of a postmodernism literature in a way that he used it to spark some interest on self-consciousness and criticism on topics such as history, philosophy, politics and plenty others. However, he used a language that is used by everyday people and one that can relate to many in order to convey postmodernism.