haI quoted you from the autopsy report which you can find online.
I think you are quoting Dr. Isenschmidt, who was not the person that did the autopsy but a random expert witness. It is true that Isenschmidt said that others in a group of DUI have had higher levels of Fentanyl when tested and didn't die but on cross Isenschmidt admitted to the defense: the median level of fentanyl among another group (statistics on overdoses) was below Mr. Floyd’s. And even that evidence was poor, it showed something like 30% which is really the top of a bell curve - so there are people in the world that can take Fentanyl a lot better. That doesn't mean anything, statisticians can prove all sorts of things if you just limit yourself to the top 30% in the world, nobody needs to be hungry, everyone is rich and drives Ferrari's.
As with all drugs, it doesn't matter whether or not someone else can tolerate higher levels, there are many aspects that go into whether you can tolerate it. The fact he had 75% of his arteries blocked probably didn't help.
He also conceded to the defense attorney that although he does know that Floyd had taken a LOT of Fentanyl before he even left his house, he doesn't know whether Floyd took more Fentanyl right before or during his arrest (the pills in the back of the cruiser testify to that) because in his own words, blood tests don't show WHEN a drug was taken, it only shows up later.
Again, there is tons of testimony, only taking out of context what the prosecution wants to admit, isn't creating a fair perception of the trial. Off course the prosecution will only show what's the worse for the defendant, and the defense will only show what's best. In this case however, all the defense has to do is cast reasonable doubt.
Is it possible that he died because of the knee? Sure. But that's what's called a but-for causation. But-for he wouldn't have left his house that day, but-for the guy in front of him didn't stop at a traffic light, he would've been 5 minutes earlier, but-for a meteor fell out of the sky, it doesn't make his landlord or the guy driving the car or 'god' responsible for what happened. But-for the police hadn't arrested him, he may (or may not) have been alive and nobody would know his name, just another junky dead either now or in the near future. That doesn't mean the police were responsible, also doesn't mean the police weren't responsible or didn't contribute to his death. The EMT arrives and they do a "scoop-and-scoot" why - because they were afraid of the crowd. So if they hadn't done that and tried to resuccitate on the sidewalk, he could've still been alive? Maybe, maybe not? But for the crowd hadn't formed, this would've been a lot calmer? Maybe? Maybe not?
Again, what the prosecution has to do is prove that it is exclusively the fault (manslaughter) or his personal intention (murder) of Chauvin for Floyd to die. All the defense has to do is prove that a bunch of aspects went into his death and it probably wouldn't matter whether or not Chauvin put the knee on his back (as the neck/blood choke theory has since been disproven).