I agree with this 100%. Doctors actually prescribed something pretty similar to this back in the 80’s as part of a VLCD (Very Low Calorie Diet) for the treatment of morbid obesity. Lots of patients died of heart failure so they stopped doing that. The If It Fits Your Macros approach is doesn’t really square up with the chemistry of human metabolism. It’s nonsense.
Try eating 20g/day of sugar packets a day for a few weeks. I reckon visions of sugar plums will start dancing your head very shortly. Sugar addiction is real and it ends poorly. A gram a sugar is a carb is so is a gram of fiber. The body reacts very, very differently to those two things. The jury is pretty much in on that one.