Another lie by Machiavelli. Let's break it down.
1. Mignini did nor summon Raffaele.
Perhaps true, perhaps not. Given the record of what PLE left behind of the process they used to entrap Raffaele, it really is hard to tell.
2. Sollecito first agreed but then, when he came he invoked his right to remain silent.
When did Sollecito ever invoke his right to remain silent? If Machiavell has actual evidence of this, he should present it. Most certainly we cannot review the tapes of his interrogation, the one where he was threatened with a beating.
What happened was the Sollecito was presented with a right to give confusing evidence, most particularly by PLE refusing to allowing him to consult a calendar, so that he could distinguish the days of the week, and dates of the month, one from the other, prior to the horrible murder.
Machiavelli, however, just like the courts in this wrongful conviction, do not deal with "evidence", they deal with prosecutorial assertion and it is up to the defence to prove them wrong.