I don't know but if he's from the US, it might not be for the only reason. If I was American I'd sure be trying to get a second passport. I've even asked myself if i should be considering it considering how close we are and how it could very realistically get really unsafe real fast for us. It's not even that far fetched. I wish i had a parent who was born in Europe, I'll tell you that.
But as far as immigrating to Canada, if proximity to Montreal is a main criteria, there's Ottawa. I don't see why bother with the added hassle of going through the process to live in Quebec. I worked for IRCC and EVERYTHING is more complicated for applications to come to Quebec. Everything. Except if you're from France.
This province make everything more complicated, longer, a bigger pain in the ass. I swear, every single program, every single rule, prerequisite, anything - always has some difference for Quebec. To the point of being ridiculous and hard to imagine any reason other than just to make sure it's different. It's so dumb.
Ottawa isn't far. If i was immigrating here and didn't speak French, I wouldn't bother, I'd go to Ottawa and when i got my citizenship, the last step, I'd move to Montreal if that's what i wanted.