Although not mentioned in this review, the station referred to was the Detroit News' 8MK, which began regular operation with primary election results on the night of August 31, 1920.
Popular Mechanics, December, 1920, page 872:
NEWS BULLETINS BY WIRELESS LATEST NEWSPAPER FEAT
Wireless operators, amateur and professional, on land and water, within 300 miles of a certain Michigan newspaper-publishing office, are now privileged to receive news bulletins by radiotelephone from 8 to 10 o'clock every night. The innovation was established during a recent primary election in the state, when provisions were made by the newspaper for sending the returns out through space as fast as they came in. The electric-wave program on this occasion was made particularly interesting by the inclusion of several musical numbers, not only from a phonograph but by actual connection with transmitters on a theater stage, the transfer from wire telephone to wireless being made in the newspaper office.