My take on the autopsy report:
1. The fractures extend from the base of the head to the orbits. That's a really big fracture, without displacement and the shearing damage from the impact tearing of the veins would cause the subdural hemorrhage. Bruising of frontal brain tissue from the contre-coup effect. Some brain tissue damage appears in the region of the cerebellum, which controls coordination of movements. ( As someone else pointed out - somewhat similar to the Natasha Richardson death from a head impact while skiing - she was well enough to get back to her room on her own power, but decompensated quickly and with enough damage that she couldn't be revived and died within 2 days, from an epidural hematoma. Her injury was in a different area and technically a different type, that is more rapidly fatal, but the general idea of being able to talk and ambulate after the injury only to succumb hours later.)
2. The left anterior descending coronary artery stenosis is high-grade, but focal. He has a right coronary artery dominant system with little plaque at all. There is no plaque hemorrhage or rupture and the stenosis is likely minimally symptomatic, and also not likely to cause significant cardiac dysfunction as he has a very healthy right-dominant system that maintains cardiac perfusion.
3. No soft tissue hemorrhage in the face or neck, so there is no evidence that there was a second "blow" to this region - ie: didnt also fall forward and hit something else.
4. No blood in mouth or abrasions/lacerations that would have suggested a seizure or frontal trauma.
5. No aspiration, no vomiting, no food in the stomach, no pulmonary blood clots or evidence of COVID-related lung disease.
6. Toxicology is straightforward. Two prescribed drugs are present in therapeutic levels.
Basically looks like a reasonably healthy 65 year old who suffered a catastrophic fatal traumatic head injury, with only one impact.
