Pretty much anything produces toxic fumes if you get it hot enough. Air produces nitrogen dioxide, for example, water produces ozone, and table salt produces chlorine (and sodium vapor, of course, but that condenses before you have a chance to breathe it). Those fumes, which require temperatures far above cooking temperatures to form, aren't PTFE; they're a cocktail of nasty fluorocarbons which are bad for you too, just not immediately fatal the way they are for birds.
So "the most nontoxic" is pretty darn accurate. PTFE is substantially less toxic than air, water, table salt, cellulose, polypropylene, or pretty much anything else you're likely to put in your mouth.
So "the most nontoxic" is pretty darn accurate. PTFE is substantially less toxic than air, water, table salt, cellulose, polypropylene, or pretty much anything else you're likely to put in your mouth.