There's a requirement of presence.
There has to be some tie to Canada. It's possible that we could get jurisdiction in other ways if there's a Canadian victim, but with incitement to genocide, that might be a hard argument to raise.
That legislation requires prosecution by the Attorney General. It doesn't allow for private prosecution. The government would have to try it. As to whether they could try it without his being here on the basis that the incitement to genocide had potential Canadian victims, it would be a novel legal theory.