To his defense, the point is to do it because you want to do it. A while ago, I made a post asking questions about something I wanted to brew. Pretty much every reply was telling me it didn't make sense to do it, and to just buy the commercial product, or to make something entirely differently than my plan. Ultimately, the thread turned into insults and name calling. I had to have Josh delete the thread because repeated requests to mods were ignored. I did brew that beverage and while it didn't turn out as planned, it does taste good. My wife and I have some tweaks planned for the next attempt.
I think the information that I found about lite beer might be enough to have some fun with in a brew attempt. I don't think he'd turn out a bad batch. Might not be quite what he was hoping for, but it's probably worth a shot, given that that is what interests him. If it doesn't work out for him or isn't practical as others are suggesting, I doubt it'd be a total loss.