Litterally.
Fact 1: Visa is one-time only. And when you landed as the PR you are PR. I can't not become non-PR, cross the border and land to become PR again. So everybody is first time landed immigrant.
Fact 2: People are able to link their PR card application
(1) + (2) => everybody should be able to link their PR card application.
Simple math. Hope it's clear.
Math, Logic, Comprehension - I am glad you are here to school us on everything under the sky. Did it ever occur to you to ask if something is not clear?
I mean to say "Initial PR Card application" when I said First time landed applicants.
Also read the response from my post above from CIC agent regarding app linking, I posted what they told me.