probably they PIC/PF was afraid of tail strike)
Very probably, aren't we all afraid of that?
It provides for a magnificent tail clearance, but invalidates takeoff calculations and prolongs the ground roll
Once the nosewheel is off the ground, the takeoff calculations are history, and you are in to real life. In this particular case he still had two engines, so the little picture you posted of Rotation Rates v Screen Height starts to look rather irrelevant.