I know you think that, and you can think what you want, but the medical examiner was quite clear that the choke and neck compression, as well as the fact they left him on the ground in that position after the fact, killed the guy. Were there other contributing factors? Yes, because there almost always are, but the dude died DIRECTLY from the treatment of the cops. He was pronounced dead an hour later, he didn't have a heart attack an hour later. He had the heart attack in the ambulance.
So I get your opinion, but the facts are not in your favor, and when you repeat them because you saw a video and think you can make an educated judgment, just know that the people who are paid to know, the people who examined the body and cut it open and get paid to figure out why people died, they say that you are completely wrong.
The EMTs also have a shit ton of blood on their hands, because they could have saved him as well, but acted like disinterested onlookers instead of trying to save his life, which is their fucking job.