The mistake you make, Albertini, is to assert that there is a difference to the presumption of innocence between the investigative phase and trial phase. There isn't, which is why neither a suspect (investigation) nor a defendant (trial) ever has to "demonstrate/prove their innocence." It is the police who rule one in or out during the investigation, not the suspect by proving/disproving his innocence.
Well clearly it isn't a mistake because, as i keep telling you, the phrase was there in the AG report.
If it was a "mistake" with no firm standing, do you really think the phrase would have been contained twice in the final report?
The police usually ask questions such as "where were you on the night of...." the answer they are looking for is for firm evidence to rule the suspect out of the investigation.
In order to do that, in essence, the suspect has to prove their innocence to the events in question.