From your link:
"I don't know if there are backdoors - but it doesn't matter since there are so many vulnerabilities."
It was on the news that the NSA was hacking on Huawei. Maybe China was using the vulnerabilities and spying, but the US definitely was doing that. Now they want to put actual backdoors on American devices.
Since then they said they would start using more open source and open their systems for being audited by third parties. The Chinese government didn't complain about increasing the security of Chinese made devices, the opposite of what is happening in the US.