If I was traumatised and couldn’t remember an exact date but you pushed and insisted that you needed one so I gave you one I thought could be the right one, but it wasn’t, am I a liar who fabricates evidence?
Nobody is expected to have total recall - in particular people often do not remember dates way back in the past. The Courts certainly recognise this obvious fact. I wouldn't have expected an investigating officer to have 'insisted' upon a date. However, the more recent an event, the more a witness is likely to be able to recall it. Also, witness statements have a narrative to them containing events that are a source of collaborative evidence.
The Ulster case showed you could have internal injuries and be pouring with blood and it can still be interpreted as consensual
You may well be right - however, the following snippett was taken from the Irish Times
Overall the medical evidence was of little benefit to jurors one way or the other. Both doctors agreed the injuries did not prove penile penetration or a lack of consent.
There were two doctors, one instructed by the prosecution and the other for the defense.