As far as I understand the nomenclature, PFAS covers both the inert final products like Teflon and reactive intermediates, degradation products and reactants. It's a very broad category of chemicals.

My understanding is that the bigger danger is e.g. a Teflon-producing plant than the final Teflon products (assuming the Teflon isn't damaged and heated too much). Because the plant has to handle the reactive ingredients, and those can leak into the environment.