From what I can tell, that site is straight up BS people.
While there ARE permissions for Canadian businesses to legally import replica firearms, there are NO permissions for US businesses to export replica firearms into Canada. Or rather, no such permission is possible for the US businesses because legal importation is dependent on the receiving party inside Canada having the necessary legal permission. The US businesses can export all they want into Canada but there's no guarantee of the stuff actually making it past the CBSA.
In addition, there's nothing about the pictures shown that would suggest those guns are Canadian-approved in any way.
"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."