I'd argue permanent weight loss is primary a function of if the diet works, and most don't. Including "not overeating - that's it." There's a reason people overeat and it's not mental. Their satiety/energy system is broken.
People overeat because they've developed habits and routines over years or decades that allow them to do so. Permanent weight loss is all about breaking those habits and changing routines so that overeating isn't normal anymore.
[1] You list a daily caloric intake of 2300 calories for your fad diet, which is a normal amount and a good number to aim for. Weight loss will be slow, but slow and consistent is good, as you've discovered.
You're simply wrong about weight loss. That's not how it works.
"As long as you don't overeat" is like "assume a can opener." If we knew how to not overeat we wouldn't have an obesity epidemic on our hands. That's the whole reason "don't overeat" is not useful dietary advice whereas "eat lots of cream" is.
CICO is about teaching people how to eat when hungry (actually hungry, not just craving a pizza), but no more than is necessary. It boils it down to the essentials, and I would argue that it's not tautological, it's axiomatic.