Well did Hellmann accuse the PLE of misconduct? Clearly in Italy being suspected is not being an official suspect.
Perhaps you are being sarcastic or satirical here and I simply am not sharp enough to detect it.
Hellmann did not explicitly state that the police committed misconduct.
However, by saying that Amanda should have had a lawyer, he was implying that the Italian CPP - either Article 63 or Article 64 - had been violated. And furthermore, the CSC had ruled, in a complex fashion, that Amanda's interrogation statements could either not be used against her or against anyone else in the criminal case (first statement) or against anyone else (second statement), except for the calunnia charges, based on the second (spontaneous) statement, which were instituted against her sometime after Patrick Lumumba was released. The CSC ruling was on the basis of her rights having been violated by police and prosecutorial misconduct - either Article 63 or 64 (I am unsure which). The prosecution and courts found justification in an earlier CSC ruling to continue the prosecution for calunnia based on her alleged "spontaneous statement" to Mignini, IIUC.
What Hellmann did not pursue was to launch a criminal investigation of the police for the violation of CP Article 377-bis, which makes it a
crime punishable by imprisonment to induce someone, by threat and/or violence, to make a false statement to a judicial authority (such authority includes police and prosecutor in Italy). Instead, the Hellmann court convicted Amanda of "simple" calunnia (where "simple" means, for example, not done to cover-up another crime).
I have no idea what you mean legally by being "suspected" v. being an "official suspect". These terms are not defined in the CPP as far as I have been able to determine.
The police were obligated, under CPP Article 63, to stop the questioning and get Amanda a lawyer as soon as she uttered an incriminating statement.
Under CPP Article 64, she should have been told before questioning began of her right to remain silent and her responsibility as a potential witness, she should not have been subjected to any treatment that would alter her ability to recall or evaluate facts, and she should have been provided with a lawyer. These were all the obligation of the police in conducting the questioning.