People are unique. Personally, I know I have to keep my carb level relatively low. Many years ago, when I first did Atkins, I calculated my "critical carb level" (point at which you stop losing) at about 20g. I lose weight only if I keep my carbs at <20g, and I maintain at about 20-30g. Again, this is just my personal situation. For me, making sure I get sufficient, high-quality protein is the key to losing.
IMO, the key to effective weight management is to know one's body and how it responds to various nutrients and not try to adjust to whatever claims someone else makes. What works for that person may be the worst thing for someone else.