It's perhaps the most pernicious misunderstanding of calories on the internet.
All calories are not created equal. Even just taking the same ingredient (say, an apple) and preparing it (say, by sticking the apple in a Blendtec Blender vs eating it whole) changes the amount of calories available for absorption.
https://www.verywellfit.com/why-are-there-calories-in-solubl...
https://www.bodybuilding.com/fun/ask-the-macro-manager-does-...
So is the reason that the calorie content in the apple changes in blending due to how difficult (or not difficult) it is to digest?
It wouldn't add calories, but it would make more calories available in the sense that your body is able to extract them.
For instance, cooking food makes more calories bio-available.
The way we process it is by cooking it.
Fire was an important technology because it allows us to predigest food, getting more out of eating the same amount of stuff. This certainly does increase the calories available in the ordinary usage of the phrase -- but so does the blender example.