works for orange juice as you can create concentrate by REMOVING water. Does NOT work for alcohol as you have to ADD a substance (=weight) to create powder. And alcohol does NOT contain water that can be removed to further concentrate pure alcohol.
Hint: There is no weight difference between 1kg liquid alcohol and 1kg powdered alcohol.
Overall, it might work for pre-mixed, freeze dried drinks that have a fair share of water and rest of the chemical compounds involved are solids solved in that water (like vodka-orange) but any weight reduction here would come from the water involved. But it even wouldn't work if you tried to move on to whisky-cola, as the aromatic components in the whisky are mostly fluids, too. If you remove them, you remove the taste. And you can't replace them by adding water.
So the only advantage of powdered alcohol would be to prevent the orange juice powder in the drink-mix to turn into some sludge. But you will pay for that with additional weight from the substance needed to trap the (liquid) alcohol.
Basically, this is a novelty item and won't be any more than that, except some extreme cases where "dryness" matters more than weight.
Always remember: Alcohol is not a solution!