

Teflon itself is perfectly safe. It’s far too large for your body to absorb.
But many of the byproducts involved in the production of teflon are much less safe.
In other words, if you already own a teflon pan, you’re fine. Keep using it. But if you’re considering buying a new pan, there are good reasons to avoid teflon.
IANAL, but it certainly seems like he may have a case for promissory estoppel.