https://apos.ab.ca/Outfitters/BecomingAnOutfitter
Very simple
They have a business and one of the shareholders/officers is a Canadian citizen
They can then own allocations and be guides/outfitters/ and hunt here
I’m pretty sure they are not in the business of bringing others to hunt
They are doing this for their own enjoyment and for their show
They may call it a “lease” but they are just referencing the name that they are most familiar with. The term for the same thing may vary in different states or provinces
Leases in Colorado for example are for hunting permits