I've mentioned this a few times, but length of pull doesn't really matter with a bullpup the way it does with a conventional rifle.
A conventional rifle, LOP directly effects everything because the pistol grip is fixed to the receiver.
With a bullpup, the LOP is just where they stick the grip. It has no effect on overall weapons length, where the optic sits, distance the rest of the controls are from the shooters hand, etc.
Grab an AUG or X95, and 'shorten the LOP' by gripping the magazine like it was the pistol grip. Nothing else (optic placement, weapons controls, overall length) changes. Then grab the front of the cutlas handguard like it was the pistol grip, simulating an increase in LOP. Nothing changes.
Conventional rifle: LOP changes everything:
Bullup LOP change - only effects where the pistol grip is, has no effect on sight placement, weapon length, distance to other controls: