From watching your video you are stuck on high gear. Even at that high idle the belt should be just about at top of clutch pulley. When you throttled up you could see a point in which the belt had quite bit of slack in it and when you let off throttle the belt was not returning to the rest position. At idle the belt should be at bottom of variator and at top of clutch pulleys. As you accelerate the first thing to occur is the clutch engages than the belt movement will occur. Check the CVT for bad or improperly positioned rollers and check that the clutch pulley is not binding and returns to its full closed position.
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