[gozzoo]

I think he concluded that both - cooling or heating the beans before grinding leads to better extraction

https://www.youtube.com/watch?v=yXCboVCDHLw

[hellisothers]

Interesting, seems like he is validating the findings of the paper that grinding cooler beans produces more fines and you should strive for fines and derive the rest of your technique around optimizing the fines.