Besides, I've watched a good few Hoffman videos - including his high end grinder reviews - and while they are great, they aren't scientific standard double blind tests. They're just him in his kitchen.
I did search in case I missed anything, but can't find any videos that you might mean. If you have a specific video in mind, please link it.
Maybe look more into who he actually is before dismissing him? He's a National Barista Championship winner and has decades of professional coffee experience and knowledge beyond just brewing a daily cup. He also co-founded a roasting company that became the largest wholesale specialty coffee supplier in London. It's not like he just popped onto Youtube one day in 2016 and decided to start making coffee videos.
Though keep in mind that his palate is especially refined. Average Joe buying a coffee at Baskin Robbins isn't going to notice the difference between different high end grinders.