The Roselawn crash was an ATR-72-212 and was aileron reversal caused by ice bridging behind the outer sections of deice boots. Found to be due to the de-ice boots being of inadequate size, the boot size was increased about halfway to what the engineers wanted to prevent future repeats. It was also found that the ATR could suffer control reversal with clean wings near the stall during early testing and this was corrected with VGs fitted in the location to adjust the airflow over the ailerons.
Tailplane icing and stalling will normally result in control pulsating and then nose down pitch. In the video there is no evidence the nose was pitching down until it rolled over, quite the opposite in that the nose seemed to increasing in pitch before it rolls over.