The UK system has the concept that Parliament is the ultimate authority of matters. So courts there interpret laws but are unable to reject them.
Canada on the other hand has a constitution which lists different rights that people have, and Parliament has no authority to take away some of these rights. There is some controversial leeway with some of the rights where Parliament, using the ‘Notwithstanding clause’, is allowed to temporarily ignore some sections of the Constitution, but they have to keep renewing that every several years or else it expires, and it can’t be applied to some rights like voting rights.
Regarding this specific law I’m unsure of whether there’s anything in our constitution that would prevent deporting irregular migrants to a third country.