ISP perspective: a shitload of people are using Huawei and/or ZTE for GPON networks now. I am at lot less scared of that for last mile access stuff, than I am of people who think it's actually a good idea to use Huawei or ZTE as core routers for major ASes (in the same places you would see a twin $250,000 pair of Cisco or Juniper modular chassis based routers).
They say that in the article: "In close collaboration with Huawei we have customized Bahnhof’s powerful 10 Gbit/s router HN8255WS, and it’s finally ready to put up for sale."
AT&T is not a company that's effectively a government arm. They may have a cozy relationship, but it's a major difference.
Also, you have some expectation that a company such as AT&T will respect intellectual property. US offers strong protections there.