Not sure exactly, but international trade law is weird, and generally bills of attainder are targeted at one or more individuals rather than classes of individuals. If a law defines a class, like "anyone selling goods from China" then I don't think it qualifies as a bill of attainder. I did find this article on Lawfare from 2019 where Huawei challenged parts of the NDAA because it specifically forbade the executive branch from buying Huawei gear. The courts ultimately did not agree with Huawei.

No, but making it illegal to be named Garrett Langley and CEO of Flock would be

If a law punished a specific murderer or group of murderers it would be, but not if it punished an entire defined class of murderers equally. Lawmakers generally describe the qualifications of a crime (e.g. "anyone who knowingly and willfully causes the death of another person") and prescribe a punishment for anyone convicted of it, and then the courts determine whether or not individuals are guilty by whether they meet the qualifications laid out in the law. Bills of attainder are laws that define individuals or specific groups as guilty by identity, not qualification, which means they don't get a trial and the judiciary doesn't get to act as a check on the legislature.