Sticking to the scene on the video. Two thing spring to mind. It is not a static line drop and the troops appear to be in 'clean fatigue' ie without the usual kit that an op drop usually burdens the paras with. I agree the larger the sicks the longer the DZ needed. Doing full para, door bundles and wedge from a C Mk 3 took and considerable time.
Still interested if they have cleared the A400M for para door static line drops.