You are reading correctly.
The hitch and expense comes from the theory that they can use interchangable barrels, bolts and magazines to switch the same platform to 5.56 when necessary for NATO requirements. Bigger problem.
I'd say that's a huge problem. While you might get away with swappable upper receivers, the lower is going to be the pain. as magazines designed for 7.62x39mm curve quite a bit more than 5.56 NATO. You'd need to slant cut the front of the mag well a bit to allow for that. Or, build the mag well for the 7.62 magazines and an adapter to get a proper fit for NATO 5.56 magazines. Either way, seems like a logistics headache