The temperatures I’m familiar with and can find online are much lower than what you list, specifically starting to decompose at 250c and significant decomposition over 350c.

I’d be worried about putting this on a grill or frying it. It’s theoretically mostly safe in terms of temperature, almost.

Wikipedia already has a section addressing temperature overlap between food and Teflon decomposition:

https://en.m.wikipedia.org/wiki/Polytetrafluoroethylene#Safe...