I can imagine so, that's pretty far fetched, unless what is meant is a basic genetic connection to the Asia region, just as I, someone of euro descent, has an essentially african set of genes.
But anyway on the topic of early use of metal on the NW coast, best theories I've read include 1) stuff traded its way around the land mass from Asia over Alaska and down the coast and 2) Asian vessels floated over here on purpose or not. There are early 20th century news reports of Japanese fishing vessels being blown out to sea and ending up on the Washington coastn no hands aboard or all dead. The more far-fetched accounts, IMO, are those suggesting successful voyages by Asian ships to the American coast and back. Not that they didnt have the technology, its that we dont have records of that and I think they were focused on exploring Malaysia and India.
Re: Pacific NW First People and weapons, actually I've always been struck by the limited presence of much warlike gear out here, according to what records I know of. I'm not saying they didnt go to war, just that relative to the people on the plains, doesnt seem to have been as much emphasis. By necessity, I'm sure, plains people had a heck of a lot of pressure as the white westward expansion picked up steam.