I had the same thoughts with regard to the "sharp force injuries". I have never seen it stated like that. I looked it up and found some pathology training sites, etc. on that. It can cover more than a knife. It also means the wound is not serrated if I recall correctly. It is pointed or a single blade or double edged and more possibilities. This is if I read it right and recall correctly
My guess is they needed the charging document and the coroner gave them what is needed to do that. Tests and autopsy will likely continue. It does not mean this is everything. It may also mean they have not matched a weapon to the wounds yet (or found one perhaps).
I also think there may well be bruises, signs of a beating, scratches, etc. That though would not be needed for these first documents, just enough to bring charges. As hard as it is to believe, it has only been a few days. Further testing is ongoing I would bet on it.
All jmo.