Yes, but he’s blathering about it here to try to make it sound like he’s got a lower-calorie product than he has. That’s how manufacturers use the serving designation—and they’re free to determine what their serving size should be.
I can’t see it that way since the product has quite enough merit on its own. 6 ounces of Coca Cola (half a standard can) or 16.9 ounces of that slightly sweetened tea (the whole bottle)? I think if I were calorie counting I’d know which one I’d prefer.
That's the full extent of the "blathering" and it's tied, I believe, to a set of loose standards about what a serving can be for the sake of those FDA mandated nutrition labels. A 16.9 ounce serving would exceed this.