There is a good chance you are right, but FWIW the autopsy said his cause of death was homicide. The author brings up the subject only to point out that Seattle cops did not cheer Floyd's death, as the rioters apparently believed.
I say it was accidental death, and I don’t have to worry about my job like the coroner. In fact, coroners are one of the most easily corrupted positions. They are usually not wealthy, believe in being honest, but are easily pressured when BIG things come down.