I stand corrected. Will watch more of his videos. based on those posts.sorry, what?
James Hoffmann is the most knowledgeable and balanced Youtube reviewer I know of - and yes I did watch a lot of reviews. He (and his team) did their homework intensively and his have done fair amount of scientific researches, and blind testing.
For the video in question, yes he does own a particles analyzer and did a fair bit of tests with it. Remember there is still not a solid ground (pun intended) between particles distribution (and even more importantly, shape) and the taste of the coffee/espresso. You have to realize on the taste bud of the reviewer, and if I have to choose one, it's James. Also a grinder is more than just particle distribution, it's retention, noise, easy of use etc.
James is not perfect but he has a profile that most baristas can only dream of, and I find his style of presentable to be easy to watch and understand. He chooses his words carefully to make them on point but also balanced - and he always stresses that it's his personal opinion. He showed class acts during the years (when he actually gave the eye watering 20k$ espresso machine to his supporters before publishing the review to avoid a wave of people to register his patreon just for a chance of winning it, etc.). He also never recommend something because it's "more expensive" (he did review some absurdly expensive ones, but just for fun).
James has done, probably more than anyone else, good things to coffee world in the last decade. calling him the "The Absolute Sound Michael Fremer for Coffee.." is very unfair to him
Peace.