It might be true, but I kind of really doubt it. For four reasons, and all those reasons are the source of that information.
1) Hackers are criminals, and these hackers are criminals with a religious / moral agenda, so they totally can't be trusted by nature.
2) Ashley Madison itself is in the business of being as discrete as possible with their client info, but they're also in the business of facilitating sexual affairs with married people. So there goes any chance of them being trustworthy.
3) Then there's the fact that people can and do lie about themselves when setting up their online accounts, especially if that account is at a website for people who want to cheat on their spouses. I know I wouldn't give my real name and address if I joined that site. But if I worked or knew somebody who worked in Ottawa, that would be a perfect place to pretend I'm living in.
4) The fourth and biggest reason is the fact that this 'statistic' comes from a news story, and (like their southern counterparts) Canadian news outlets are full of their own social-political ideals and full of sensationalist crap. Lemmy give a recent and perfect example.
Just as the hacking story was breaking, there was another headline in the Ontario news. It was about a man who was walking a pit bull, and the pit bull attacked him and killed him for reasons not known. All the major news outlets covered the story in their headlines, and all of them ran "relevant" related stories and opinion columns on why pit bulls need to be banned worldwide immediately. The usual moral outrage ensued, of course.
Then it was confirmed that the dog a) wasn't a pit bull and b) didn't attack anyone. Some of the outlets released a quick update with the new facts, many forgot all about it quietly. Most of the major Canadian news outlets, by the way, are famous for their left-leaning ban-everything ideologies, and their limitless self-righteousness. And they love a good moral outrage.
That's four possible information sources shot right out of the sky by the credibility cannon. So who can you trust?