Xiaomi isn't explicitly mentioned in that article and I have no doubt they put backdoors in their products for the Chinese Government. I guess my question is, would you feel differently if they were a US company and it were the the US Government holding the keys to backdoor?
There's a reason China has been investing in developing it's own CPUs and telecommunications hardware and it isn't so that it can more easily spy on others. It's because they themselves no longer wish to be spied on... and maybe so they can spy on everyone else a little too.
I'm not saying it's right. I don't know what I'm saying actually. I'm just going to grab some tin foil...