I watched the whole vid, was intrigued from the first few mins when he described a very intuitive and somewhat Peat-related approach: lots of carbs, lower stress, high agency lifestyle. He then goes into his staple meal being red meat and rice, plus unlimited fruit, which seems like a pretty solid way to run one's diet.
But it also made me think about how just being active every day is such a huge factor in one's body composition. This guy, like many YT fitness influencers, don't have "real" and sedentary jobs, including stressful commutes. They just live a "more natural" life, are on their feet way more, always moving, don't have low-grade stress associated with constant use of Microsoft Office products (lol!).
I've noticed this effect pretty pronounced in myself. I'm an office worker by day with side business ambitions I work on during evenings and weekends when possible, so it's a lot of 'modern day office work'. I also do intense weight training 3x a week and a few bouts of cardio via martial arts, so I'm in reasonable shape - strong with slightly visible abs and ~15% bodyfat.
But when I'm not working, not having an alarm clock, for extended periods of time, my physique just takes on that extra ~25% of quality that's hard to describe - everything feels and looks tighter, more abs visible while at same body weight, energy levels and lifts are maybe 10% better automatically, etc. I tolerate any and all foods way better too. I really get the sense that if I focused on living life this way for more than a few weeks on vacation here or there, I could be making these dumb "here's my life as a fitness guy" videos lol. Just being on my feet walking some European city on vacation for a few days does incredible things compared to standard north American life, and people like Bill live closer to the former than the latter everyday.
Not meant to brag, but rather to say that I believe most anyone could quickly and continuously improve their physique and physical well-being if they make appropriate trade-offs in life. And I'm sure those of us stuck in the corporate North American grind can continue to find and apply principles to improve our health and fitness too.