No. It's not allowed. Canadian BDUs are not allowed to air commercial advertising. Except where stipulated by simsub and blackout rules, they are required to broadcast the original programming. In a few cases, they can fill BDU designated advertising slots with ads for their own products. It's possible that the station itself made a programming change, a simsub was applied incorrectly or that a Canadian station incorrectly requested a simsub. Note that BDUs may monitor simsubs and to make corrections when they are incorrect or the Canadian station has technical issues. From what I have seen, SD does not do this and available staff are often not qualified to correct simsub errors. First, make sure that the issue is with SD and not the originating station. Many Rogers areas do not get Detroit network stations, they get Buffalo instead. If this is a regular occurrence that can be traced directly to SD, file a complaint with the CRTC.