That is why I would say that they lied at least three times: in the first press release, the preliminary report, and the preliminary audit. And that is why I would regard with great skepticism the allegations presented in their preliminary audit, and further publications — unless these can be verified by independent investigators from publicly available data.
And the OAS isn’t all that independent at the moment, with the Trump administration actively promoting this military coup, and Washington having more right-wing allies in the OAS than they did just a few years ago.
Not to mention that the U.S. supplies 60% of its budget. But the OAS has horribly abused its mandate in election monitoring before, helping to reverse election results as the U.S. and its allies wanted: most destructively, in 2000 in Haiti; and also in the same country in 2011.
More evidence: in the last three weeks, the OAS has refused to answer questions from journalists, on the record, about their statements or reports since the election.