That is correct - only HC lenses manufactured recently can be updated to the relevant firmware which allows AF on the X1D (all orange dot ones, I think, are safe). I surprised the local Hasselblad dealer in showing him that my ancient Leica S2 had no issues focussing my older HC 100, where as the X1D allows only for MF and, of course, aperture and shutter control. The reason here I think is that the Firmware requires lots of extra data for contrast AF, which does not fit into the Firmware memory of older lenses. HC lenses also do not auto focus on a Leica S, when used in Live View (thus, contrast AF).
Hope that clarifies (may not help, though ...).
For me it was one of numerous reasons to stay with the S system.