Because if he's gonna drink anyone- which is his choice, something he needs to evalutate, and a separate-issues Alpha Male will still benefit T levels. Just not as much as if he weren't drinking. The decision to drink is a separate one from taking Alpha Male. Awareness of its effect of T and other health and training issues is important. Alpha Male will likely benefit the training and health of someone who drinks. Probably even moreso for someone who doesn't.
On the other hand, I'd wager that Alpha Male might even help someone who drinks even more. Alpha Male might be uncessary for a young colege student who's T levels are through the roof. Even moreso for a non-drinking one. Maybe for a drinking one, it'll give that added benefit and maximize endogenous T.