You’re confusing thermal energy and temperature.
Your body doesn’t “pump out 99 degree heat”.
And radiative heat transfer still works just fine in space. You said so yourself. The capsule and everything in it will come to thermal equilibrium, all the while radiating heat out into space.
You’re right, physics is harder for some than for others. Take, for example, the first rule of holes: when you’re in one, stop digging.
Well said. You have more patience than I do.