In this context presumption of innocence is different from presuming the crime did not happen. Presumption of innocence could be that even if you 100% sure corruption was pervasive you keep in mind that the people on trial might actually be innocent scapegoats.

That's also something the sentence at the end of the trial may cover: "not having carried out the fact" versus "the fact has not occurred".

At this point, there is neither indication (nor a guilt sentence, either).