And that is the problem. The Police have fucked this up so badly. By consistently calling transwomen "women" it means that when they say an attack was carried out by a woman, the public have no way of knowing whether it is a female or a male attacker. The police have massively eroded trust over this.
Yes - irrespective of the facts in this individual case and whether the attacker was actually woman (unlikely)- the damage has been done. We don’t trust the police and can’t believe what they say. The police have done this. It’s their fault.