I've definitely seen brands of cookware that obfuscate their use of PTFE nonstick. The brands that use Kyocera ceramic coatings often specify that by name. Even cheap brands like Green Pan play it straight. So you have to do a little bit of due diligence, but it's pretty easy to avoid the hidden PTFE. Some kind of trustworthy certification would be an improvement no doubt.
I’d like to think it was actually some kind of neutral, non-harmful clay, but I guess the problem with clay is it can be made of whatever is in rocks, which is basically anything.
Sometimes I wonder if we discover that "ceramic" is also bad for health. As I understand it is really not meaningfully defined. And I also think about having heard that it is sometimes sacrificial that is that it wears out... Meaning it might leech something to food.