Wrong. As in other Western European countries, and the USA, Art 530,1 is a simple upholding of a 'Not Guilty' verdict, as found by the lower courts.
Problem is, in the Knox/Sollecito case, they were not found 'not guilty' by any of the valid lower courts. This must be legal history.
As you know, criminal justice works by (1) a trial by jury (2) an appeal if allowed on a point of law only, or new evidence, or perversity, or 'public interest' [miscarriage of justice]. In Italy, all persons found guilty automatically have two appeals (unlike almost anywhere outside of Latin Europe, i.e., inquisition-style tribunals) so there is an automatic appeal = (3) The supreme court. In England and Wales, Scotland and N Ireland, the Supreme Court is reserved for rare 'constitutional matters' of law only (for example the Brexit challenge).
Thus Italy's justice system, you could say is fairer to a defendant than ours.
To sum up, Amanda Knox and Raffaele Sollecito were found guilty by trial with jurors, that included both laymen and trained solicitors. The guilty verdict was upheld by the Appeal court. The Supreme Court annulled the verdict under Art. 530,2, the get-out clause normally reserved for the guilty you cannot convict because they are high up and there might be diplomatic tensions so one uses this. IOW the court finds the defendant guilty but uses 530,2 as a way of getting them out of prison, but without exonerating them in any way.
We see this come into play when Raff was refused compensation for his four years' imprisonment. Had he had a verdict of 530,1 he may have been granted it.
That's your unsupported theory. I remember reading very similar discussion about this very subject before and your opponents presenting legal documents stating what SC is authorised to do. In this case, SC stated gross violations of the due process and the BARD principle and, as a result, "fixed" the verdict, fully according to their given powers to do so. Your claims what they "normally" do in such circumstances remain just words. Can you bring any legal document that supports your statements that 530,2 aquittals by SC are somehow different in legal consequences from those 530,2 acquittals of the lower courts? Otherwise, it just wishful thinking from your side.