i think the creator is good. I think they are just scraping different power company outage maps. If you look in some places there's 0 data because the power company doesn't have a true outage map
If you go on the page for Manitoba Hydro, it says there is 1 customer in Quebec: "South Cypress". Although South Cypress is a municipality in Manitoba.
Seems like a data issue where the municipality was double-counted and one in Quebec for some reason.
https://poweroutage.com/ca/