Yep, it's an EBMM thing. EBMM doesn't sell proprietary parts like bodies, necks, Silent Circuit, speciality pickups, etc. for a variety of reasons. They want to sell guitars, not parts.
Among other things, this makes the number of EBMM partscasters out there virtually zero, which I appreciate. When you buy an EBMM, you know exactly what you're getting and who stands behind it.
That said, these kinds of things can be found on the used market from time to time.