Don’t take the word of money grubbing, grant obsessed scientists that this is accurate or useful in any way for researching historical climate. I have not read the pdf and I don’t intend to. Call me cynical
If the scientists didn’t keep this all closed up in their private hidey holes, there would be much better reason to believe their conclusions. There’s no better review than to allow the entire world to see what you’re doing.
And, there’s one problem right off the bat — joining together these decade-long lives of our little shelled friends at the bottom of the sea. If the data is too fuzzy it won’t even be possible to see back into the Medieval Warm Period.