I truly don't understand what your point is. If, in your parlance, we have been rolling 3 dice all along then this means our previous 1000 years of climate data

I truly don't understand what your point is. If, in your parlance, we have been rolling 3 dice all along then this means our previous 1000 years of climate data is truly extraordinary since this is the first time seeing a number greater than 12. So extraordinary that it is not plausible to think that we have been rolling 3 dice all along. Of course this is possible in a similar way that it is possible that an unseen intelligence has been controlling things all along. The point about seeing 13 is that the set of outcomes have changed. We are beyond the realm of thinking that nothing has changed. It's not the we have always been rolling 3 dice; it's that we are now rolling 3 dice.