If I take a present state, like the Earth in the year 2022, and apply an evolution law to it, then that will give me a past state in 3978 BCE. If I then take that past state and evolve it forward in time again, I will correctly get back to the year 2022. Trouble is, I can do that for any evolution law. There is always some state six thousand years ago that, together with the right evolution law, will correctly result in what we observe today.
