> I meant by real scientists in a lab, not a YouTuber. Like a consumer testing lab maybe, or a university.

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.