It's someone broadly sympathetic to the same kind of ideas that lie behind the current article, he's just honest enough to admit in this case it was all built on propaganda.
edit to add:
Also the Wikipedia page on US intervention in Chile before and after the coup, which the original article tries to play down dramatically:
A real "We had to destroy the village in order to save it, and now the villagers don't support our neoliberal politics, the ungrateful idiots!" vibe.