OK. What evidence would satisfy you that Amaral was an authority on the case up until the point he retired?
What evidence would satisfy you that Amaral considered himself an authority on the case and that many also considered him an authority?
What evidence would satisfy you that Amaral was the most (in)famous Portuguese policeman internationally that there has ever been?
What evidence would satisfy you that Amaral publicly promoted the view that there was no abduction, that Madeleine died in an accident and that her death was covered up?
What evidence would you require to satisfy you that the majority of Amaral's income since retirement has been generated by his book and the promotion of the contents of his book ever since?
If the answer is that no evidence would satisfy you of any of the above, do you instead lean more towards the view that Amaral was not an authority on the case, did not consider himself an authority on the case, nor was considered by anyone else as an authority on the case, was not the most (in)famous policeman to have ever come out of Portugal and wielded little or no influence on anyone with his book or media appearances, that the majority of his income since retirement has not been as a result of his link to the case, and that he has never once suggested that the McCanns covered up the death of their daughter?
As to your answer to my previous question: Can you explain exactly how a public announcement of guilt by a person in charge of a case might affect someone's right to a fair trial? And how would stepping down from such a role change the effect that such a public announcement would have on the safety of a potential trial?
It's not up to me to decide what evidence you need to support your opinions, it's up to you.
All I know is that Article 10 prevents the authorities from making statements suggesting that someone is guilty of a criminal offence.
430. With regard to statements by the authorities concerning criminal investigations in progress,
the Court has reiterated that Article 6 § 2 cannot prevent the authorities from informing the public
about such investigations; however, it requires that they do so with all the discretion and
circumspection necessary if the presumption of innocence is to be respected (Fatullayev
v. Azerbaijan, §§ 159-162; Garycki v. Poland, § 69; Lavents v. Latvia, §§ 126-127; Slavov and Others
v. Bulgaria, §§ 128-130).
431. The Court has stressed the importance of the choice of words by public officials in their
statements before a person has been tried and found guilty of a particular criminal offence
(Daktaras v. Lithuania, § 41; see also, in the context of interviews to the national press, Butkevičius
v. Lithuania, § 50; Gutsanovi v. Bulgaria, §§ 197 and 202-203).
https://www.echr.coe.int/documents/guide_art_10_eng.pdf