Go back and read the article, Vietnam is one the United States does not have an extradition treaty with. But, all that really means is there are no circumstances in which the US can be guaranteed access to extradite, and will instead have to deal on an individual basis. Vietnam may or may not pass someone like this back to the US, they may prefer to execute him, and I don’t think the US would really interfere.
Also, come on … Michael Hunt? This one is a Poe, whether he’s ridiculing this type of dickhead, or really is this type of dickhead and is too scared to do it under his own name, this one most definitely isn’t real.
Besides, if he was real, just like @TBTabby says, he didn’t get the job. Any Vietnamese company hiring foreigners for any reason is watching that foreigners social media, and they see something like this, job offer is gone. And without the job offer, he doesn’t have much chance for a visa.