The McCanns were still arguidos at the time. No way would the ACC of Leicester police do anything which in any way inferred that UK police believed the PJ was wrong to make them arguidos - even if they did think that. It would have caused a diplomatic incident and damaged relations between the two police forces. So he chose the middle 'diplomatic' road.
IMO the McCanns were badly advised to make that request whilst they were still arguidos.
He could have remained silent, but he chose to speak. Kate McCann gave an interesting insight into her thought processes as a result;
All of this the assistant chief constable for Leicestershire made clear in a statement written for the court. He had
come out to Portugal shortly after Madeleine’s abduction and had seen us at our most grief stricken, and yet he felt able to comment of Gerry and me in this statement: ‘While one or both of them may be innocent, there is no clear evidence that eliminates them from involvement in Madeleine’s disappearance.’ We were completely staggered. No evidence to eliminate us? [madeleine]
According to Kate, the ACC had seen their grief. Does grief equal innocence? That seems to be what she thinks, because she offers no other evidence which could eliminate them. Very faulty logic, just like her comments about Paiva;
Ricardo Paiva played a more prominent role in the interrogation this time, which did nothing to maintain my equilibrium. This was the man who had invited us to his home for dinner. Our children had played with his son. ‘
[Madeleine]
Here she is assuming that because Paiva socialised with them he should or would let that influence him when he was working.