[lrkr097]

Flying around the Earth super fast won’t literally rewind its state. It will erode current state but not restore old state. An accurate physical theory needs to account for events we can’t recreate influencing present state. That’s hard when objects and forces of influence can be separated by millions of light years at this point.

What these physicists are working on though is a math framework that might help simulate old state by being able to account for eons of time and vast distances traversed. So our intuition is as you say it’s just hard to accurately model what things would look like if such a reversing was to happen.