This narrative points to no proof expecting motive to suffice. I think the US is not the only motive hypothesis. It would have made more sense for the US to blow it up earlier. Given that the pipeline was unused at the time of destruction it seems more likely a Russian intelligence ploy executed from Baltic ports.
I think the Swedish investigation, with no public announcement, might be the only source of primary information. Add to this the sabotage against German trains etc, and the overall lack of ability of the Russian government to negotiate for its interests but instead choose subterfuge (they denied the invasion, and claim themselves the victim), it is more likely such a secret operation is in the interests of the aggressor.