I am not aware of any evidence to support this claim.
For Newspower to make this claim they would need access to the business performance data of all newsagencies. They do not have access to this.
My long-established newsagency sales benchmark studies, which I publish here, that started when my newsagency was a Newspower store, represent the most comprehensive comparative analysis in the channel yet even that does not cover all stores. It does, however, cover data from businesses in all groups except for the WA lucky charm franchise.
I am not aware of any evidence supporting the Newspower claim.