It looks to me as if it's all true.
Hitler wasted a lot of resources on "vengeance" weapons to satisfy his battered ego. I can't recall any strategic effectiveness of them except for saving some face for the Nazis. And expediency dictated the US import and protect people for whom justice would have been a work camp in Siberia.
The point of the article is also true, that thousands of slave laborers died producing the technology the US acquired, and the killers of those thousands were in effect pardoned.
Was it worth it? I don't know, but I'd say probably. I suspect I would have done the same thing had I been the "decider".
Arf