I cannot swallow this set-up view. It seems inescapable to accept randomness as a basic fact of reality, not as a mere reflection of our ignorance. Where the laws of statistics apply, ontological indeterminism and randomness are at play. Because the laws of statistics are also relevant for the study of heat, this means that heat cannot be reduced to classical movement. My second objection is, that reducing heat to mechanical movement is incompatible with the manifestation of the arrow of time in thermic phenomena.
Mechanistic phenomena are completely symmetric with respect to time.
If thermodynamic phenomena are reducible to mechanistic movement, they should also be symmetric with respect to time. But this 'solution' does not hold, because the time symmetry of mechanical laws does not permit to collect independent evidence concerning the reality of this 'very improbable start configuration'. It is just as likely that we live in universe that seems to us to evolve from such a 'very improbable start configuration', but that in reality is moving towards a 'very improbable end configuration'. In order to see this point, consider thermodynamic reality at a broader scale, where it also encompasses your own body and your own brain and your own surroundings. In that case, the movements of atoms and particles that cause your thoughts, happen to produce a correct idea concerning the direction of time.