.... the propellers will always curve rearwards when entering water due to the resultant force of forward airspeed.
Eh? If the prop is producing thrust (as in this case) it is doing so by hurling air backwards, particularly at the tips. If the tips then try to hurl much denser water backwards they will bend forwards. No doubt. What you're saying is that the aircraft airspeed is greater than the thrust airspeed coming off the prop tips. In this case the aircraft was doing 250 Knots so .......... prop tips go forwards.