He explains that this carver is leading his turns wtih the inside leg, instead of just matching the inside leg to the outside leg's intentions. There isn't anything ground-breaking in the speech, he's basically just explaining what you see- well centered skiing that is evenly balanced and not over-driven. He also comments on letting the ski do it's own work after set into a turn.
Japanese Demo skiers are a strange breed that puts PSIA into a category of skiers and not side-of-the-hill talkers. J-Demo skiers spend entire seasons repeating the exact same run, run after run in aims of the perfect set of turns. They rarely, if ever, venture off from their chosen training line. It's kind of insane to witness... but to each his own, I guess. They don't share my passion for skiing, but they are definetely passionate. I've ridden the chair with a bunch, as I often go night-crudding. The ones I have met seem a bit stringent. Quite frankly, I think they talk too much. The'll get 1-2 runs in my 7.
One evening in particular- it snowed all day with heavy winds blowing downslope. The groomer came out at 5pm and perfectly groomed a non-lit run. I went and skied it and it was the best groomed snow of my life- ankle deep and perfectly smooth and continually wind-buffed. I spent the next 2 hours arcing that run while the demo guys stayed over in the almost-bumped-out terrain. I invited many over with me while on the chair but every single one declined because they want to ski "natural" conditions.
So... I had it to myself. I couldn't convince them that quality snow was fun. They considered it cheating themselves out of training.