Hi,
You absolutely correct, man there are dozens of reason for the people who wants to fly back, like as you said, to see the family, may be any emergency, parents sick , siblings are not well, someone in grave situation, God forbid someone died, may be i have a business in several countries i want to go there, i owned property, i have a job offer outside canada, and list goes on...
See, i am in a whats app group of around 130 people, and discussed more than 7 or 8 people who few recently like 1 week or 2 weeks back, they clearly mentioned to me that they are not asking anything relates to permanent or temporary landing, they just don't care, and frankly speaking this have to be done from the country you are departing correct, like the recent law says that no one can board the flight whose CoPR has been issued after 18th Mar, so airlines around the world know the regulations and they will not allow you onboard, similarly they have said that you should not do temp. landing but they haven't forced it.
People are coming back flying in and out, so for me personally i dont think there will be an issue as you are not doing anything illegal.
And the question you asked about a proof to show intent to settle, i have a reply from them for one of my whats app group guy, whose CoPR expired and he informed that he is "Ready to Travel" and they sent him a long list of documents to show canada they he is coming permanently after the extension and not temp. just msg me in pvt i will send you the screen shot how it looks like so you have better clarity around it.