I thought YouTube videos weren't evidence of anything? Or is that only when it's convenient?
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The max takeoff weight of a 757-200 is 255,000 lbs. The max takeoff weigh of a BAe 146 is no more than 95,000 lbs. The bigger plane is going to produce more debris.
They also very clearly state that papers were scattered up to 8 miles away. On the other hand, human remains and other non-paper debris (e.g., a burning seat cushion) from Flight 93 were found miles away from the alleged crash site (plus paper debris, which is irrelevant for the purposes of this discussion).
Think about it - how could human remains get scattered that far? People weren't losing rib bones out the windows on the way down - it would have to happen after the impact. Is there a force that can carry a rib bone, or other human remains, 2 miles (or more) through the air? Although I doubt it, I'm not sure - I would have to calculate it.
PS - notice the extreme transparency of the investigators in the video. I would call that an example of normal, expected behavior.