Individual molecules don't have a "temperature". Temperature is a statistical property of a collection of molecules. In any collection of gas or liquid molecules at a given temperature, some will be moving more slowly, some more quickly.
That makes the SSDD/BillyBob theory even more peculiar. In their theory, the slower moving molecules in a hotter gas somehow know that their neighboring molecules are moving faster, and thus those slower molecules know they also need to reject the slightly lower energy photons. Or is it the other way, that emitter molecules know not to emit towards the slower individual molecules in a hotter gas? In any case, the molecules show intelligence on multiple levels.
Billy and SSDD need to quantify their new theory exactly. Specifically, is the intelligence with the emitter or receiver?
Does each emitter-molecule know not to emit if a receiver-mass of temperature warmer than the emitter-mass will be in the emission path at some point in the future?
Or does each receiver-molecule know not to receive if the receiver-mass is warmer than the emitter-mass which the photon came from?
We need to know if the actual photons are flying through space or not, at which point we can continue the discussion.
In any case, the molecules show intelligence on multiple levels.
SSDD's causality violating, all knowing, future seeing, smart photon theory is funny.
All created to back up his "no back radiation" theory.