This means that Western Ontario (aka Kenora) was wrong in tzdata between September 22nd and October 13th. tzdata usually includes Kenora in America/Winnipeg, but when Winnipeg decided to go to permanent daylight, Kenora and the rest of Western Ontario was left behind leaving a strange and ambiguous situation that wasn't clarified until October 13th. If the Ontario government wouldn't have done the right thing at the last minute tzdata would have had to do something like resurrect the America/Rainy_River time zone.