Yes I think, I can feel the surround feeling when using headphones. Not sure whether it is a placebo effect or not.

I tried using Dolby Atmos app before, cannot hear the surround effect on my ears. Feels less power.

That is not positional audio, that is spatial audio like surround. Without spatial audio when u use headphone, the sound sounds like from center of your head instead of around you.

positional audio is top, down, left, right, behind, etc sound sources.