You could be right, but that still doesn't matter since we are not interested in what the pulley does in response to the clutch engagement for this procedure. After it's snapped over and engaged, the clutch handle becomes a super handy method of sliding the crankshaft and flywheel to the left AND right depending only on which way you move the handle. We never disengage the clutch during this process either, we are just using the handle to move the crank in it's main bearings, without bringing out the pry bars, blocks and sledge hammers. Instead of all that hassle, you just sit in the seat, move the clutch handle judiciously and read your dial gauge - how much easier can it be made to be? Explaining it is not so easy, however.
So easier done than said in this particular case.