I tend to ignore posters who ask for "proof" about anything in this forum because that's a big red flag they have no clue what they are talking about. There is no "proof" in science. But then I realized the Hi Theory is not science! The different past proposition is binary. Either the past was the same state or it was different. We cannot prove one or the other, but we can falsify one. If one is wrong, the other must be right. Hence, by falsifying different sate past we indirectly prove same state past.
If the past state was different, then present state dating techniques would fail at a certain point. This is testable and falsifiable. Let the point of failure be known as the threshold, or T. If different state past is correct, present state dating techniques, psdt, will give accurate results for items younger than T. Items older than T will not be accurate. Let the magnitude of the error, me, be 100. The psdt for an item that is T + 1 years old, yo, then returns an age of T + 101. T + 2 returns T = 102, etc. This means that psdt should never return a result between T and T + mo, in other words a gap in the age of all items ever tested.
There is no such gap. Hence, there different state past is falsified, hence same stae past is proven.
Let the hand
ing begin!