https://en.wikisource.org/wiki/Agreement_of_the_Chamber_of_D...
"g) It has made frequent politically motivated and illegal arrests, in addition to those already mentioned of journalists, and it has tolerated the whipping and torture of the victims;"
Excuse me if I find it difficult to believe in it. I don't think you should take it as a representation of the truth either.
Also your history is wrong; the document was used to justify 'impeachment' (because such a concept did not exist in the chilean constitution); the coup itself came afterwards, when Pinochet wrested his leadership of the military into overall civilian leadership, and I would not be so sure that the authors of the document intended the course of action that happened to be an indirect consequence of their petition.
The document, btw, passed the chilean legislature 81-47, which while not the two thirds required to remove the president, is still quite a supermajority.
Anyways, I think it should be the default assumption that governments torture people. There are scant few that haven't.
There was some preparation for guerilla operations, from both sides, in case a coup happened (as it did) and some armed resistance to the expropriations (which were legal according to the then valid laws).