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I just watched one of his videos on appearance of modern espresso. He was talking quite a lot about old-school espresso we used to make 10-15 years ago and the darker roasted coffee we used compared to today's lighter roasts. Quite a lot of interesting points about the quantity of coffee we used to use, how that resulted in needing a darker roast and why that method now doesn't make a good espresso with a modern light roast.
he actually did it the absolute madman
https://www.youtube.com/watch?v=AI4ynXzkSQo
@ above posters. Have used a Commandante hand grinder when working in a cafe. Quite satisfying to use, but not especially fast. Have a Porlex mini which is generally used for picnics, much fiddlier and doesn't sound as nice but still decent. Attached a drill to it once and almost rounded off the hex shaft top, so don't try it without a special adaptor like linked earlier...