In materials science "ceramic" means basically any inorganic, nonmetallic solid: https://en.wikipedia.org/wiki/Template:Fundamental_aspects_o.... This includes perfectly safe materials like alumina, mullite, and silicon nitride, as well as things you definitely do not want in your food like lead oxide, lead zirconate titanate, barium titanate, uranium oxide, and beryllia.

So it is not accurate to say, "Ceramic itself is safe".

(I have no idea what is used in the surfaces of "ceramic" pans but it is unlikely to be any of the substances I listed above; they all have high surface energy.)

Ceramics can be glazed with lead. It can also end up in ceramics that are used in cookware[1].

[1] https://www.npr.org/sections/thesalt/2017/12/08/563808879/ca...

Is it really ceramic or something they call "ceramic" that has other additives like a metamaterial?