The Increasing entropy doesn't explain the motion of time.
The reversing the arrow of time of our universe doesn't mean changing the two fundamental nature of our universe. One, that the entropy of our universe increases and other that the universe always create everything with highest symmetry. When your edit reverse the video on your phone, you reverse the time aswell as the two fundamental nature of the universe. This does not work when you reverse the arrow of time in Hyperspace. So no matter wherever you turn the arrow of time in Hyperspace, the to fundamental natures of our universe is gonna remain the same. And nothing changes. Also, there's a misconception that the increase of entropy explains the forward motion of time. This is not true. Since even if the arrow of time is reversed, the entropy of the resultant universe still always increases (as well discussed). So the increase of entropy doesn't explain the direction of motion of time in Hyperspace. This must be noted.
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