That's right.
Of course, this is assuming that they are unable to satisfy Elections Canada, through identification, as to their residency. We can imagine so many problematic scenarios. There are maybe two parents living in the home riding and three kids who are all working abroad. Which one of them doesn't get to vote if, for whatever reason, they don't have proof with their name on it? They wouldn't have had a bill going to their parents' address.
You can just imagine multiplying scenarios where the one voucher per voter rule doesn't make sense. That applies in resident voting just as it does in non-resident voting.