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Bukan nak troll ke ape. Unsure how non-caloric deficit diet can help losing weight

Scenario
1. eat 2k calories, absorbed 1.8k calories, spent 1.7k calories = gain (caloric surplus)
2. eat 2k calories, absorbed 1.8k calories, spent 2k calories = loss (caloric deficit)
3. eat 1.5k calories, absorbed 1.4k calories, spent 2k calories = loss (caloric deficit)

Be it keto / low carb / vegan / fasting / carb cycling diet / xyz, fundamentally it is still calories. Just different execution on how eating is being done.
I count wrong? Wrong logic?
If eat 2k, absorbed 1.8k, 200 goes as body waste, spent 1.7k, and still losing weight, where does 100 go? Got Alien tech beyond our human science?
I cannot brain it wei


Non credible source but this is what I've been taught in my physics class


If you're on X diet don't count the calorie input vs output, how do you explain your X diet is making you gain / loss.
Saying I am not on deficit by I am losing weight is like I don't work but I got money dropped from sky.