Wow, that sounded bad. But mines is not like that, you only hear it or feel it on the pedal when your releasing the clutch, but could be the same thing.
Did you went with a single lightweight flywheel or went with another dual mass?
Yeah, it started off as a light click/knock. It may or may not be in your case, but I heard what sounded like the two halves trying to meet in the middle when it would do that. It really only got like the video when it was driven for extended periods, especially under load (mountains).
Transmission issues were actually why I ended up getting rid of that car, but it was replaced under powertrain warranty with the same dual-mass flywheel. If I were to do it on my own, I'd go for the GM Performance clutch/flywheel.