Just like every document released by Snowden, this is another part of the scandal, the US is worried about people buying Huawei phones because the chinese might be spying on people, but the reality is that they are doing it to everybody in the world and always denying it, I don't know who believes in those lies...
Let´s be real, the technology introduced in the world is too much in such a short amount of time and normally big countries like the US want to be informed about everything so they can have an advantage to make a move before anyone else.