People ask why the people servicing it after landing (in the photos) are in hazmat suits. It's because of the hydrazine and N2O4.

Yeah, it's an amusing article but it's not about Tetrafluorohydrazine and there don't seem to be any others in the series that are. Tetrafluorohydrazine also doesn't seem to be the same thing as hydrazine which is used as a fuel in some spacecraft.

The article does mention tetrafluorohydrazine being added to FOOF which is the actual subject of the article and a comment mentions tetrafluorohydrazine being used as an oxidizer for rocket fuels.

the article mentions hexafluoride. but LANL did (and probably still does) hydrazine. source:

https://patents.google.com/patent/US2690378

(used to intern, and subsequently work there, although not as a chemist, of course. i'm not that smart)

and if you want to pedant that the patent wasn't issued to los alamos nat'l laboratory... well, in '54 things were different :)