If we follow the stages that Ian created, it's not a tip tackle.
He is not stationary.
He does not lift the player
He does not twist the player
The players legs do go past the horizontal (through the spped and strength of the hit).
The Player does land on his back/nexk, but not because the tackler had dropped or driven him.
I believe that was a hard and strong dump tackle, it could have been called as high, but that's all IMHO.
Red Card Harsh, Yellow Card would have been harsh too IMHO, Penalty justified if for high.
I can see why it looked like it, and why at one look the officials thought it might be, but where they DO have the ability to ask the TMO, as the do in the AP, perhaps a check would have been worth while:
Ref to TMO: "We believe we have a tip tackle and it's a Red Card, can you confirm if that's correct"
I can see it being appealed, and possibly overturned.