You're describing different things. Teflon is a brand name of PTFE, which is a finished polymer. PTFE is considered safe until it has been subject to heat stres

You're describing different things. Teflon is a brand name of PTFE, which is a finished polymer. PTFE is considered safe until it has been subject to heat stress and undergoes thermal breakdown (around 200C). This makes use of PTFE as non-stick coating in cookware potentially dangerous. GenX and PFOA are notionally different chemicals used in the manufacturing of PFTE. They are both used to accelerate the polymerization reaction. It is nominally possible to have finished PTFE products which do not contain relevant (choose your definition) amounts of either family of chemicals. GenX and PFOA are both toxic in themselves, regardless of use - unlike teflon.