Why must we come up with all these silly convoluted ideas about breath and oxygen, that honestly make no sense using either real world logic or statospheric logic. One Piece devils fruits are defined Staticly, or by mass consensus of what the metaphysical state of such an object or concept entails. The only time real world logic comes into the situation is when you have expansions of the powers of a fruit within its own logic and that logic is not conceptual but property based.
IE Rubber as opposed to doors. One being a property the other being a concept.
99% chance that Absalom has the invisibilty fruit, or the transparency fruit or the glass fruit. Whatever you want to call it. He has the demonstrated abilty to make other things invisible and everyone is pushing their minds to figure how he points a SEEMINGLY empty palm at someone and then they get an explosion in the face? Seems really simple to me.
1. He was holding something in his hand that we couldn't see because it was INVISIBLE!
2. His powers have the same concept that Sue Storms do.
Occams razor. Which though everyone seems to forget does in fact apply to one piece. Soap cleans things! Thus it can clean and remove metaphysical concepts, simple. Doors open through things, therefore it can create doors in anything. Once you have this in your mind you can realize that there is a very simple logic to most of the devils fruits. IE if it acts the way you THINK sand should act (drying people, sand storms) or if it acts in a manner that you find PLAUSIBLE (electrical radar, doors) then it does work.
As for an explosion? Come now, the difference between fiery explosions and airbursts is an easy one and there is little to put it either way. Luffy creates similar "explosions" when in gear 2? Is there anything really exploding? Or is it just the speed involved. Same concept. Seeing an explosion doesn't make it gas or breath or anything.
The most advanced possible concept for this devils fruit is going to be an illusion one (ninja vanish is a cloud of cherry blossom petals). And that is pushing credibility.