For one thing. The most plausible reason he can't find the plane dropping the buoy he privides himself.
-It's a small device. -Better to use a boat. -Better to use a non military boat.
Yeah? Maybe that is what they did?
It's not impossible the source filled in a few gaps in his story? Or was mistaken? Or Hersh himself might have?
I don't want to go full conspiracy mode myself here but one thing is for sure. And that is that not finding proof of a covert operation can only mean one of two things. Either that it didn't take place or that it indeed was covert.
And why could the source not have said Stoltenberg worked with the Americans since the Vietnam war as a figure of speech?
Hersh article is not enough to base an opinion on imo. But it's not precisely worse off after this guys rather hollow arguments.
Howrver the analysis is not a bad start.