I thought the same thing, but turns out the body is really damn complicated. Worth skimming the papers they link in the video - basically your body adapts over the course of ~6 months or less if you become more active by saving energy elsewhere. Things like inflation and basic metabolic functions can burn way more energy than they need to.
Nah the key is to get rid of insanely calorie dense ultra processed garbage that digests in minutes and makes you feel like shit. Roast chicken breast with tons of herbs and it’s delicious - you can quite literally eat as much of that as you can physically handle and you wont gain weight. Plenty of ways to cook veggies that make them delicious. Fruits arent that many cals and fill you up. Unsweetened yogurt is the same cals per protein as protein powder. Dont eat cereal or half the packaged garbage in the grocery store. Just eat real food and it’s a million times easier to lose weight.