These elements of your post are incorrect.
Amanda Knox was convicted of "simple" calunnia ("criminal slander", but more accurately, "stating falsely to a judicial authority, such as the police, that someone had committed a crime, knowing that the statement was untrue"). The conviction was delivered by the Hellmann court and made definitive and final by the Chieffi CSC panel. There was no statement in the Hellmann court motivation report that Knox knew her statement to be false because she was at the scene of the murder in the cottage at the time it occurred. Rather, that MR stated that Knox should have known that Lumumba had not committed the crime because she knew that Lumumba and Meredith Kercher were unacquainted, and because the police were suggesting to her that Lumumba was the murderer. The logic of the Hellmann court MR was challenged by the Chieffi CSC panel, in that they suggested the calunnia should be considered aggravated, but the Chieffi CSC panel did definitively finalize the "simple" calunnia conviction while suggesting that the Nencini appeal court re-examine the issue of aggravation.
The factor of aggravation in this situation, under Italian criminal law, would be that the person committing calunnia had done so to hide from or escape responsibility for another crime, namely, in this case, the murder and rape of Meredith Kercher.
The Nencini court did convict Knox of aggravated calunnia, which was consistent with their conviction of her on the murder/rape charges.
However, the Marasca CSC panel annulled all the convictions of the Nencini court (one charge, carrying of a knife, was beyond the statute of limitations) and acquitted Knox (and Sollecito) of all relevant charges, including the aggravated calunnia. But this left the previous conviction for "simple" calunnia made definitive and final by the Chieffi CSC panel, and this conviction could not be changed by the Marasca CSC panel under Italian procedural law. Thus, the Marasca CSC panel stated that that conviction remained in effect as did its sentence, which Hellmann had allocated to time already served by Knox on remand or attributable to the Massei court preliminary conviction.
These facts may affect your thesis about the Marasca CSC panel motivation report statements.