Most of those interviewed in the video say they see themselves as either South Tyrolians or Italians (or both)
uh... how does that differ from the poll? There's a reason a merger with Austria wasn't asked - nobody wants it or even talks about it. Austrian colors in that poster notwithstanding.
That's not to say that an independent South Tyrol wouldn't have close ties to Austria or that South Tyrol doesn't have close cultural ties to Tyrol even today. (One thing to wonder about is whether an independent South Tyrol wouldn't lead to North Tyrolians asserting their cultural independence from Austria more. It's all academic though - independence isn't going to happen, largely a matter of "wanting it but not wanting it enough" / claiming to want it in order to demonstrate cultural independence from Italy - as long as there's a strong autonomy statute o/c.)