Re: "Huawei is a private-owned company, nothing to do with the Chinese government.."
Its been many years since having a copy of the blueprints is all you need to make a copy of the product.
The Chinese do copy western aircraft. No matter how secret or stealthy a plane is as soon as anyone has half an idea of what it looks like you're able to buy a flying model from your choice of any number of Chinese suppliers. Of course, shaping a bit of foam isn't quite the same as building a commercial airliner but it shows that the basic skills are there to quickly make something and make it fly.