You obviously haven't watched the video. At approx 28.30 ...
"The impact velocity under chute is 17 knots.
The impact velocity at 60 knots is 12 times more energy.
At 100 knots, it is 34 times more energy.
At 180 knots, it is 112 times more energy."
Dg800 yes, the prob50 / prob99 suggestion was made up but it was based upon the above.
With knowledge of the above, what would you suggest would be more realistic?