HarmonyOS is also a highly locked down OS with good support for the PRC to do the surveillance its domestic laws allow. Sure, the US can also surveil you through your phone, but in ways that are much better understood and subject to far more stringent regulations.

I think there are lots of good reasons to discourage its use in the US beyond just "propaganda."

Huawei can't sell fully functional phones anywhere outside of China, including in Europe. You need Google Mobile Services and the Google Play Store to be able to install stuff like your banking app, and the US government is preventing Huawei from shipping phones with it. China has its own app ecosystem, so they're fine locally but screwed everywhere else.