I do it way different than the video. I think my way may be a bit easier for bigger dudes (I'm 6-2, 200).
Be on the left side of the ski, clip in, get it started, lean it over so the pump is unhooked and brap it a couple of times to clear it out (the last thing you want is for it to bog when it's go time). At this point be right in line with the bars with your legs straight down or even forward a bit like you are sitting in a chair. Lean the ski back upright until you can feel the pump hook and then nail it with the bars turned slightly left. The ass end will drop and you will get swung rearward by the resistance of the water. As this happens, allow the seat to slide under your chest and then rest all of your weight on it. You will now be able to easily swing your knees over onto the rear deck and continue to climb up onto the seat while under power. Sometimes, if I bail in a bad spot, when boarding I will ride out of trouble from the kneeling position and then climb the rest of the way on once I am out of the break zone.
I have been doing this for a while and have never realized it isn't how others do it.