Plus it is a move more about tax purposes, it doesn't really change the amount time he actually spend in Canada.
well, that's exactly what bothers people like Mr.Prysse. Canada's social services are tax-supported, so when someone is seen as benefitting from them while not paying their "fair share" of income tax, some people get upset.
But his parents worked and paid taxes all through the time he was coming up through Tennis Canada, and I have no doubt he's given back to TC in other ways, plus his success has raised their profile and brought them more youth interested in playing. Now he lives and trains somewhere else, and you can bet he's paying doctors and physios over there from his own pocket -- he's not flying to Canada to get free healthcare.