Thank you for that paper. Still raising the bar I see :0)
It looks like the authors have found a probable miscalibration in gas chronology techniques, using a known Be10 peak and a better-than-previously characterised CH4 peak.
One of the probable results is that the Temperature-then-CO2 lag isn’t 800+- 600 yrs, but something smaller. So the Vostok lines should get closer together.
Lifting an eyebrow Spock-wise: "Fascinating."