(Actually, the article is not that long, but the title is clickbait)
I thought the reason was going to be related to the increment of sea levels, as villages near the coasts will surely be affected sooner than later by the constant floods in the coming years. Anyway, I agree with the sentiment of the people mentioned in the article, it is not clear when the Canadian government will pay that money, some people with houses near the coast are retired, they just want to live a peaceful life near the sea, they don't want to relocate, so it is logical to think that this strategy of the government to offer money to leave the place will not work, at least not very well.