I believe that they changed the 50 watt rule (Section 74.1235 (d))toward Canada quite a few years ago, but they may have to get approval under treaty for the freqeuncy as Class A to Canada in some circumstances. You still can't put more than 34 dBu to a cochannel station on Canadian or US land from the other country.
I don't think that Tim Martz has anything against Canada or Canadian stations. In this instance, the application for 93.9 is just that as a 10.8 Mhz shift, it is a minor change. It can then change to another adjacent channel.
The main problem is that they are running out of freqeuncies. They need to reallocate Channel 2-6 for HD, AM, Translators, etc.
Canada has been placing new stations around Windsor that interfere with the fringe service of many other stations that have a few isteners in Metro Detroit, such as WJIM-FM, WFMK, WITL, WDZZ, WFBE, WMMS, and others but if they conform to the treaty, there's not much recourse. So it is not a one way street.