As people in this thread suggested and from my personal experience, as long as you declare non-residency to CRA then it should be fine. NR-73 is not a requirement and more often than not, it will create issues. Anyhow, this declaration is a one-way declaration. CRA will simply take acknowledgement and update your record, but they won't express their agreement. There is still chance that they will request tax return even after you declare your non-residency. Therefore, keep all your records and story. That said, nothing to be worried about, as long as you are doing the right thing. Cheers!