I think there may be some misunderstandings within this thread. If someone says CICO holds true, that is not the same as saying that LCHF does not work for weight loss. Although people following LCHF do not explicitly count calories, they may reduce their calorie intake without realising it, for example due to effects on appetite.
Or equally they may not?
The over feeding studies I mentioned way back upthread would seem to indicate that excess calories do not necessarily lead to weight gain.
The simplicity of CICO is alluring but that doesn't make it "true". And if it doesn't work for weight gain then it has been disproven?