Yup! Not only that, but people are not taking into account the huge amounts of fat. From the OP's carb calculations, they would've been hitting around 2000kcal, per-day, which is going to be close to many people's needs. Add to that the (I'd guess) couple of hundred grams of fat @9kcal, per gram, and it's easy to see how they became overweight
Looking at such a diet and blaming just carbs (or just fat for the PB crowd) is just absurd reductionism. The low-carbers say "Don't blame the meat for what the bun did", and the low-fat crowd say the same nonsense, only reversed.
There is a reason why those who either go to low-carb or low-fat find themselves losing a ton of weight, and for most end up reversing the symptoms of their metabolic disorders. The vegans want to say that fat is the reason people get fat, but ignore all those on keto losing weight. And certain of the LC/keto crowd want to blame it all on carbs, while mocking the preponderance of skinny vegans (A case of having one's low-carb cake and also wanting to eat it

)
It ain't rocket surgery