The club builder may be eluding to previous models of Callaways that had very short hosels. Adjusting them were problematic due to the bending bar, not impossibe if you had the correct bending bar. The XR has plenty of hosel and as long you stay within the standard of 2 deg for cast and 4 deg for forged you will ok.
I say "Standard" because some mulipiece contruction irons do not take well to alot of bending. Particualrly the ones with the face inserted into the body of the club.