Just to note, the hold down position that Chauvin made couldn't been too restrictive because Floyd could still talk and did so for a few minutes of being held that way.
I’ve heard a lot of people make that point. If someone says they can’t breathe, they are lying. If you can speak, you are moving air across your vocal chords. You can breathe. Add to that all the other fake complaints like “I’m claustrophobic, I can’t go in the car!” .... riiight, they just pulled him out of his own car.