How does the Fermi Temperature exist if the temperature is reliant on the system being equal to zero kelvin?

Hey guys, from my basic knowledge of Physics the Fermi Temperature is Tf = (Ef)/kB. I know that the Fermi Energy is found when the system is at zero degrees kelvin, such that there is no thermal energy, but how is it that there IS in fact a very high temperature that the electrons are actually at (usually 40k K).

A follow up question is if there is a different temperature for each energy level (E = kB*T), why do they not equilibrate?

I know these are probably pretty silly questions but I am not able to kind them online. Thanks