Drying out the skin would be the point; and as far as producing more oil I cannot attest to that. I've been using isopropyl rubbing alcohol for years. Also the ph of rubbing alcohol is 5.5, the ph of human skin is 5.5; so I don't know why you're saying rubbing alcohol has a very basic ph; it's the same as your skin. For rubbing alcohol to be basic, it would have to be above 7 on the PH scale.
I don't moisturize either and I do not have a problem with dry skin. I don't believe he will either. Rubbing alcohol is a cheap common house hold item that has many uses, and from my experience it makes quite a decent cleanser for your face.
I found some 70% rubbing alcohol and tested its pH twice using two different pH indicators.

According to the chart (although it's not completely accurate as using a pH meter or strip), the pH is between 6.0-6.4. So while my claim that it is basic is wrong, the pH of the acid mantle on the skin ranges from 4-5.5, putting rubbing alcohol (keep in mind I used 70%, so 90% might have a higher pH) will somewhat neutralize the pH of your skin, damaging the acid mantle. The pH of the acid mantle is supposed to be between 4-5.5 in order to kill possible bacteria, in other words, you wouldn't want to make your skin's pH higher than 5.5 unless you follow it up with an acidifying solution. So yes, Tenshi, you were right saying that rubbing alcohol is not basic, but it is more alkaline than the skin's pH, so putting it on the skin would damage the acid mantle, which someone with acne does not need.
Also moisturizer is important (especially when using alcohol) because the volatile properties of alcohol make it evaporate quickly, which will also take away moisture from the skin.
Again, not trying to be aggressive or start a fight, just saying alcohol on the face is a bad idea.