Some WiFi hubs have back doors which can control not only the router but devices connected to it.

From the details in the article, I think the back door is in the router's administrative web server, so it would have nothing to do with the specific physical platform or where that was made.

The people who found the back door present arguments that it was made intentionally.

There are hubs that run free software. That gives the community a way to try to check for, and get rid of, malicious functionality like this.