IMO the fact that COD yet has to be determined does not necessarily mean that they haven't made findings that could be COD.
Their findings may very well be complicated and they also may want some DNA answers back before they announce their findings.
Also there is no doubt that they already know wether Nora had been subjected to sexual assault or not, but they have obviously decided not to announce if that was the case or not.
I think police and pathologist know a lot already but want to know even more,
and also police want to gain more time in regards to the investigation befor COD etc is announced to the public.
https://www.nst.com.my/news/nation/2019/08/512855/pathologists-nora-quoirin-autopsy-seen-leaving-htj
Quotes from the news article:
SEREMBAN:
A team of pathologists performing autopsy of Nora Anne Quoirin were seen leaving the Department of Forensic Medicine, Hospital Tuanku Jaafar (HTJ) here at 9.25pm,
after spending some 12 hours there.
The team arrived at 9.05am
All the doctors refused to comment on the post-mortem.
Earlier, police told a media conference that as of 8.15pm,
the autopsy was still underway and the cause of death had yet to be determined.
The autopsy was conducted by Hospital Kuala Lumpur (HKL) pathologist Dr Siew Sheue Feng and Dr Hanif Mohammad of HTJ, assisted by specialists from the Petaling Jaya Chemistry Department and Forensic Department.