The report says that the fans were not responsible for the people getting killed inside the ground. It also says that the police opened the gate to the stand where folk were killed.
Yes there is an element of semantics to it, but if the gate hadn’t been opened by the police nobody inside the ground would have been killed.
People may have been injured outside the ground if the gate hadn’t been opened, but I doubt any would have been killed given the less confined nature of the space.
There had been near fatal crushes previously at that stadium in that stand.
There was probably no single error that lead to people being killed, more a chain of bad decisions.