“How America took out the Nord Stream pipeline”

Seymour doesn’t provide any proof or any evidence. It’s argument by assertion. What he writes is plausible but without any sources or other corroborating evidence. I think it more believable that Seymour has been paid to write this by a Russian aligned entity.

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 turns out to be right --and we don't have conclusive evidence, but this would upset the current narrative. Why would Russia be an idiot to shoot itself in the foot (cui bono) and blow up their leverage; though in international affairs the unimaginable is possible, so yeah they may have done it to themselves -though to outsiders it would seem illogical

If true though, it would be as big as the Gulf of Tonkin incident [as in it was us in pursuit of our own interest]

The Gulf of Tonkin involved the US claiming that a US ship was fired upon as a pretense to declare war in retaliation. The idea here is that the US blew up a Russian pipeline in order to... what? Declare war on Russia in retaliation for Russia's own pipeline being destroyed? This makes no sense unless you're accusing Russia of blowing up the pipeline.

Blowing up the pipeline is an act of war.