Welcome to EpicSki, dFiz. Your video is spectacular! (Where was it shot?)
But you're right--it is of little use for much technical analysis of your skiing. I do see one thing in it, though, that may well contribute to your problem of lifting that inside ski at the initiation. Lifting that leg (while extending, or at least maintaining the length of, the uphill leg) helps you to move down the hill, across your skis, and into the new turn. It's not a bad way to accomplish that when needed. But the error is in needing it in the first place.
When turns link smoothly and seamlessly, at the initiation of a new turn your body will already be traveling in a path that crosses the path of your feet. But your turns in that clip tend not to link seamlessly. You tend to finish each turn and then stop moving your body momentarily, causing a "dead spot" and a brief traverse between turns. Since you've stopped moving, you then need to get your body moving down the hill and across your skis again to start the next turn--hence, the lifting of the downhill ski. "The lift" is not an error or a problem in itself. It is an appropriate solution to a different problem. Eliminate that problem, and you won't need the "solution" anymore!
In the clip, compare your tracks in the run that begins at 0:17 to the set of tracks of the skier who preceded you. Your turns were not just larger--the tracks show the straight-ish traverses between the turns that I'm describing. And when you watch yourself skiing that line, you can see the hesitation of your movements between the turns.
In theory, at least, the solution is simple. All you need to do to link your turns better is to start each new turn just a moment sooner. But that may be easier said than done, and a lesson with a qualified pro would help you discover the right movements and timing better than anything anyone can suggest here in text. Still here are a few suggestions: Keep moving. Eliminate the traverse. Strive to finish each turn in what I call "neutral"--which is literally the position, sensation, and attitude from which the next turn begins. Visualize turns as "across-the-hill S's" that go from fall line to fall line, rather than as "C's" that go from from traverse to traverse. Find a continuous turning rhythm, like the sensation of bouncing on a diving board or a trampoline.
On easy groomed terrain, practice beginning turns with your balance still mostly on the downhill ski (new inside ski). Link turns together until you feel a continuous flow. Ski under a chairlift, and look at your tracks on the way back up. Synchronize or "figure 8" behind an excellent powder skier (perhaps the person who made that other set of tracks), matching his or her rhythm.
And one other thing: Learn to turn your skis with your legs only, femurs rotating in your hip sockets beneath your pelvis and upper body. Your clip shows turns that begin with what we call "upper body rotation"--you turn your upper body first, then yank your skis around using the momentum from your upper body. Among other problems, that movement pattern often leads to traverses between turns, and also often causes your skis to turn sequentially (one-at-a-time)--which can contribute to the tendency to lift that downhill ski. This "independent leg rotation" is a critical move in good skiing--and something that cannot happen on a snowboard, where both of your legs attach to the same board. Again--and perhaps even more than the timing issue--you would probably find this technical change much easier with the help of a good instructor.
Good luck, and keep those videos coming! We haven't seen much snow like that in Colorado (yet) this season, so it's good to see that it's snowing somewhere!