>Yes-ish. The concept of the heat death of the universe is the end result of that idea. The stars cool off and we are left with bodies that slowly cool down until things reach absolute zero and the universe is “dead”.

You can't reach absolute zero. Dark Energy is there, even without Dark Energy, subatomic particles will still be there, also, absolute zero on such scales and definitions would require true nothing to exist and we don't even know if that is possible

>However the radiation will happen at some point, so the body will eventually drop to absolute zero.

That's now how Thermodynamics works, at all.