And it includes direct quotes from that person in the last paragraphs. It was clearly someone Hersh spoke to directly.
While I am extraordinarily distrustful of news reports using anonymous sources you do have to consider the author here. Ultimately we are deciding if we trust him and, for me personally, he lends a lot of credibility.
The other side of this is, duh, of course America blew up the pipeline. I said at the time that we were the most likely culprit.
There's a very small subset of groups who have the capability to do this and even fewer who have the motivation. It forces Germany/EU to stop buying NG from Russia and start buying LNG from the US (among others) with exceptionally minimal political risk to the US.
The US will just continue to deny that we did it, this article will get no traction in mainstream media. If incontrovertible proof ever did surface the media will just bury the story and if anyone involved is forced to comment they will just spin it as a good and necessary and just thing that they did to help Ukraine with a dose of natural gas bad because of climate change and all will be forgiven.