I think this guy has a brilliant idea.
Half the calories and half the carbs has a very nice ring to it.
Problem is that it's half compared to a slice that weighs twice as much. Compared to other slices that still probably weigh more, there is no difference in carbs and only 20% less calories - and that's comparing a "margherita" to a cheese pie which is likely their biggest differential.
Seems to be more marketing that actual benefit. It's pretty telling that they use "slice" and not grams for the serving size...