I might die, possibly. the issue is the carotid artery. Knelling on someone’s neck, and the other side of the neck being on pavement can cut off the supply from both the left/right or strongly impede the flow, like a choke hold, which, if you keep applying it ends in death, but NOT from standard denial of air - you loose blood flow.
As a result, you might be able to SHOUT I can’t breathe even though you can, because your body KNOWs there is an oxygen problem - like someone who has lung problems they feel than cannot breathe but they cam move air in/out.
But you did’t want a factional answer probably....
Wouldn't there have been signs of that in his eyes via the autopsy? I tried to do a search using specific terms, but all I could come up with is occurrences when someone is alive.