You're probably the only person in the whole thread who is going to bring up saturated vs unsaturated fat which is always missing from the "they lied about fat" / "we need fat" story-telling.

It's (probably accidental) motte-and-bailey rhetoric where someone provides the motte "fat isn't bad for you" and then grants themself the bailey "therefore I can eat saturated fat ad libitum" when in reality you'd want to minimize saturated fats while allowing unsaturated fats in the diet.

Yet "low carb" is basically a euphemism for eating butter, eggs, meat, and cheese rather than unsaturated fats. The whole thing seems built on that motte-and-bailey.