All QD's contain some alcohol. Some contain more than others, in trace amounts it will not harm anything. Others with higher concentrations can harm wax coatings. I know the 3M QD is loaded with Alcohol.
The purpose is to reduce the vapor pressure of the mixture so the product evaporates quickly off your car. This way you don't have to go through 5 towels to QD a car!
I would guess the alcohol concentration is very low and will not harm the finish or strip wax. Alcohol adds no gloss to the paint, usually suspended oils are in the formula for that purpose.......
I remember someone posting some MSDS info on a QD a while ago, and the alcohol content was like 1.5% or something insignificant. I can't detect any alcohol evaporating off either when I sniff my QD.... not that I do that a lot!