I think you’re probably right; it seems to me that he did not cut off Floyd’s air supply, dreadful though the hold looks, but he ought to have realized that he was in medical distress, a likely OD, and might have been helped by Narcan. No heroes here; the deceased precipitated his own demise if the allegations of lethal levels of Meth and Fentanil are true, and the super-charged racial atmosphere at the site, and that’s been intentionally induced in the whole country, surely made the situation worse.
Narcam does not work with fentanyl. Also in the article they quote Chauvin at the scene stating Floyd may be on something.