Are we reading the same report? The link in GP doesn't contain the word "homicide". In fact I can't find anything in it stating a cause of death. It looks to be nothing but observations.
I'm left confused by the CBS News link. I doubt they infer that "The manner of death was ruled a homicide" (which was not a quote) from the autopsy case title, quote, "Cardiopulmonary arrest complicating law enforcement subdual, restraint, and neck compression". It seems more likely that there is another source; that the homicide ruling was made by a different entity (besides the medical examiner's office), or at least by a different document (not the autopsy report).
EDIT: The document stating that the manner of death was homicide was a press release from the medical examiner's office[1].
1: https://content.govdelivery.com/attachments/MNHENNE/2020/06/...