It's been pointed out in several places that that "affidavit" from Italy bears no resemblance to a real Italian affidavit and contains easily demonstrated errors. Ultimately, it's a document by some guy nobody ever heard of saying what he heard in a meeting with someone he doesn't name about what some other people are supposed to said in court.
The affidavit is a confirmation by an Italian lawyer, as an officer of the court, of the testimony related on the document that he heard in court. Testimony in court is under penalty of perjury, even in Italy. So yes, it’s clumsy, and not American jurisprudence, but there is still no testimony under oath that counters the alleged vote flipping in Italy of an American election, as testified to in court.