In an earlier question, which was called a duplicate, I already asked a similar question. But I state my question differently now and add something to it.
Suppose "we" would reverse the direction of the motion of all elementary particles in the universe through phase-space, reverse the expansion of space (so not of spacetime for an obvious reason) as well as the development of all quantum fields associated with all the elementary particles in phase-space (so the particles are in fact not represented by points moving through phase-space, if we consider elementary particles as point-particles).
Does "doing" all these things (performing operations) amount to the reversal of time (somewhat like showing a film backward)? I know these operations differ from the time-reversal operator in QFT. I mean, doesn't the last one apply only to tiny parts of the universe (and certainly not to the entire wavefunction of the universe)? See for example here.
