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While I think there's some mileage in the idea of reversed time phenomena, they do require a superimposed parallel universe, as I think you go on to mention
The problem with reversing time in our time dimension is that there appears to be no origin from which the reversed time can start from i.e. our 'normal' time has an origin in the Big Bang, but a reversed time flow would seem to need to start from the end of the universe, and as far as we can tell, there's nothing to suggest that time will ever stop, even if entropy leads to the eventual flattening of all energy. Hence, setting the origin for reversed time at the opposite end of 'our' time dimension seems to be impossible as 'our' time dimension doesn't appear to have an end.