Its a very badly worded sign, but consider this
It depends if it has been a historic report of rape. Some people report rapes that have happened years/months ago. They were not ready to report before - but are now. If that's the case, they will be outside of the forensic window.
Some victims/survivors also prefer to report it by writing it down rather than phoning it in. I think that they should be given every option to be able to report it by any method they feel comfortable with.
The notice is not saying that all rapes have to be reported this way - but they can if the victim/survivor feels that this is a better way for them to do it.
There are lots of reasons why victims/survivors may find it easier to report on line and not via a phone call.
They may be in a controlling DV relationship and not able to speak openly on a phone.
They may not want to talk about it on a phone call with a stranger, but prefer to write it themselves
They may live in a care facility and not be able to speak openly in the premises - especially if the suspect is on the care staff
They may be a school pupil who doesn't want to make a phone call from home (suspect may be living at their address). Also can't make a phone call from school in case they are overheard.
I think its good that we can give them an option of how they want to report it.
I agree that it is badly worded - and if it is within the forensic window it should be an emergency. We always deal with them as an emergency when they are reported - and then develop the investigation strategy after this.