What is fact: Anyone operating in the media landscape (incl. youtube gurus etc.) profits from presenting an extreme and controversial theory to things that matter to people (here: loosing fat, building muscle, being healthy). Those that propagate moderation and the necessity of fine tuning trade of decisions don't get any traction because its not controversial and not any easy way to go.
I am pretty convinced that there are a few not too complicated but maybe hard to follow principles that constitute a healthy diet. But people keep on searching for the magic pill because that is the easy way to go and find a way in that to continue addictions (sugar is biggest widely accepted adiction in western societies) and the media is feeding those needs. Just my 2 cents
I personally go about it like this: Eat as natural as possible (no processed foods), no sugar, low energy density in all the foods you take in, train hard, recover enough, about 50 % carbs, 30% fat, 20% protein (measured in energy not in weight). And never eat less than you are hungry that only will make it worse long terms as your body sees itself under extreme (starvation) conditions it wants to avoid in the future and therefore builds fat long term. It is kind of the same with any extreme diet.
Instead if no carb do no sugar and no white flour products. If you do sports your body benefits a lot from carbs but never needs sugar or white flour.
Edit: If you think about what is natural: During human evolution humans have eaten all kinds of things (at times lots of meat, at times lots of raw foods (plants) and at times lots of corn/cereal) but never processed sugar or white flour. I think we profit from a mix of healthy foods.