The timeline makes sense. The KKK was big in Saskatchewan in the 1920’s. Their target were Eastern European immigrants. Bohunks they would call them. I know a few personally that had anglicized their last names to be able to get jobs in the city.
As far as a Rutherford era radio station selling them air time. I wouldn’t doubt that it is true, Jws are good at whitewashing the truth. I’ve also personally met the guy that ran the radio station. George Naish I think his name is. He was kinda a folk hero in the Saskatoon area. He would visit our congregation from time to time and give talks. I’m not sure if he was in bethel or?