I figure the question that is of national interest is whether importing new species will result in eventual unintentional crossbreeding and damage to chicken farming and our food supply.
I am certainly no expert, but I think that the problem with any species transported to a new environment is its potential to become invasive. We have a Chinese Sumac, here, in Idaho which is quite prolific, only because it lacks its natural predators of disease and insects. It wipes out local tree life and isn’t really replacing it with anything better, just alien.
The danger of these chickens might be that they would do well - like the African honey bee did in South America.