That’s what I thought at first too, but does that matter? Not really, I think: if I want an early and a late AH-1G in 1:32, I’ll buy two kits, regardless of whether they have a kit of the early version and a kit of the late one, or one kit that lets you build either.
Giving the option in one kit is better because this means the purchasers aren’t dependent on tracking down the exact version they want to build. With this particular kit, if I want a late AH-1G, then right now I’ll have to wait longer for that to come out; and when both have been released, chances are that when I want to buy the late version, I’ll go to a (web)shop that only has the early one in stock.