Refitting VVT Unit 4.0L

Hello Folks,
Just in the process of replacing a VVT unit on my 4.0L and have a query on the directions in the workshop manual. I have attached the relevant page where under item 4 it says “the VVT unit must not be rotated on the camshaft”. Just wondered that you must be able to do this slightly
to position/tension the chain before the the VVT bolt is torqued because the VVT unit is not keyed to the camshaft which is locked and its the bolt torque locks the VVT unit onto the camshaft. Am i missing something here?
Would appreciate anyone’s good advice. Regards. Charlie.