Yeah, hard ____ is an established thing. More than that, it isn’t sold alongside non-alcoholic (lemonade, cider, seltzer, etc.). Gfuel is an energy drink, it makes sense that anything-flavored gfuel will have caffeine.
“Charged” means nothing. There’s no such thing as “charged cider” or “charged seltzer.” It looks like a generic "flavorblasted-"style marketing term to me.