What this means is that in theory, someone could land as a PR one Day 1, file the application exactly 3 years and 1 day later, and then leave Canada and go sit in a hut in Guatemala while the application is being processed. [1] After it is ready for the test/oath in 2-3 years, applicant flies back, declares a desire to live and die in Guatemala, and still gets his Canadian citizenship, a shiny new Canadian passport, and leaves the country. And all this is 100% legal, at least as per Canadian Citizenship Law as of 2013.
[1] Unfortunately, C&IC will only correspond to Canadian addresses, so the applicant does need a reliable mailing address in Canada