The video is not meant to show what bmw does, but the benefits of self level suspension. In BMW site, they do list this as air suspension. I have read post regarding failure of it. So I suspect it is as problematic as other vendors.
I have sat in cars with suspension compressed due to weight. It does make a difference. Now this applies to a Chrysler minivan. Perhaps the BMW does it better. I can't see how you can beat the problem of compressed spring? May be I am totally off the mark.
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2012 BMW X5 Vermilion Red Xdrive35d with Premium Package, 3rd Row Seats, and Adaptive Drive