IMO, if IRCC mentions 'unwilling' in their communication, I'm pretty sure anyone can interpret it with their own reasons.
Unwilling due to the job market is not an acceptable reason. We don’t know how long “unwilling“ due to covid will remain. In the example of someone moving from NZ to Canada there is very little stopping someone from travelling when it comes to covid. Both countries have minimal covid and are in various stages of lockdown. Arranging quarantine is very easy. In many ways you would do the same thing if you were landing without quarantine. You book an AirBnB and then arranged for a grocery delivery or a grocery order that someone could pick-up for you. Many groups are volunteering to pick up groceries and I have heard of AirBnB hosts even picking up your prepaid order and unpacking the stuff that needs to be in the freezer or fridge. If there are no flights that you can secure that would be different. I think there is a high likelihood people with COPR after March 18 will be able to be admitted. Think some already are but maybe only by land. You can try contacting CBSA as well. They are receiving a large volumw of questions so try not to resend questions it just delay the process. You can’t expect immediate replies. CBSA seems to reply faster.