I don’t know the truth of the matter and Seymour could be right. We just can’t tell from the evidence provided.
If this is true and more evidence comes out, the usual suspects will be screaming it from the rooftops, if not this narrative will die in obscurity. There's been a lot of misinformation about this war, and a bunch of people who for a variety of reasons want to blame the US for it and are willing to believe some incredible things if they support that narrative.