Yes, the US had its hand in Argentina as well - they supported the violent military junta that saw Peron overthrown and leftist journalists and activists murdered by the thousands during the Dirty War. When I was studying there, the family I stayed with had relatives who had been abducted and "disappeared," which was such a widespread phenomenon under the right wing government that they have a name: "Los Desaparecidos". Here's a Wikipedia article about how the CIA contributed: https://en.wikipedia.org/wiki/Operation_Condor#Argentina

Also, your article is unfortunately paywalled, but an op-ed from someone at the WSJ isn't going to change my mind.