From the judgement:
That (from the judgement) is a straightforward denial of Amaral's (actual!) duty to observe the rules of secrecy his (former) position as co-ordinator of the investigation imposed upon him.
You misunderstand I'm afraid.
In effect, and independently of the reasons invoked by the appellant for the publication,
it is hardly understandable that an employee, even more a retired one, would have to keep said duties of secrecy and reserve, thus being limited in the exercise of his right to an opinion, concerning the interpretation of facts that were already made public by the judiciary authority, and widely debated (in fact, largely by initiative of the intervenients themselves) in the national and international media.
What they [3 judges btw] said is he
didn't have to observe secrecy even if he was employed, but more so as he was retired. Particularly as those facts had been made public by the judiciary authority and had been debated by the media.